#include<bits/stdc++.h>
using namespace std;
int m,len;
string n;
int main(){
	cin>>m>>n;
	len=n.size();
	for(int i=0; i<n.size(); i++)
	{
		len--;
		if(n[i]-'0'!=0)printf("%d*%d^%d+",n[i]-'0',m,len);
	}
	cout<<"\b ";
	return 0;
}

测试数据： 输入

5 12204340220200200400024131432243122214011443000042211120431213413240204322222421043440213230343243023112222131340400120043222411430010121043324110244424203040024122042030321044120120243230323441401034033130403224110200442212040043230032302022440044002023333222321441222102213302001343202330222200012102130032402432241123044424434423430202240342004440210440002443143313430414203234000101121232343441324334102202203132041022200120321430240322132100122110113131013430121102244100020230010201100031121321234331230423203112343424404020342202211443030204410024344330024421444403204312304023041142144413000200434214014012202023000002112043310040133233211133133221424220324203231023221010441402110234103023334402014401403200423023431244034341434103224320302334333312232002141313111213242302044012322024314

输出

15^796+25^795+25^794+45^792+35^791+45^790+25^788+25^787+25^785+25^782+45^779+25^775+45^774+15^773+35^772+15^771+45^770+35^769+25^768+25^767+45^766+35^765+15^764+25^763+25^762+25^761+15^760+45^759+15^757+15^756+45^755+45^754+35^753+45^748+25^747+25^746+15^745+15^744+15^743+25^742+45^740+35^739+15^738+25^737+15^736+35^735+45^734+15^733+35^732+25^731+45^730+25^728+45^726+35^725+25^724+25^723+25^722+25^721+25^720+45^719+25^718+15^717+45^715+35^714+45^713+45^712+25^710+15^709+35^708+25^707+35^706+35^704+45^703+35^702+25^701+45^700+35^699+25^697+35^696+15^695+15^694+25^693+25^692+25^691+25^690+15^689+35^688+15^687+35^686+45^685+45^683+15^680+25^679+45^676+35^675+25^674+25^673+25^672+45^671+15^670+15^669+45^668+35^667+15^664+15^662+25^661+15^660+45^658+35^657+35^656+25^655+45^654+15^653+15^652+25^650+45^649+45^648+45^647+25^646+45^645+25^644+35^642+45^640+25^637+45^636+15^635+25^634+25^633+45^631+25^630+35^628+35^626+25^625+15^624+45^622+45^621+15^620+25^619+15^617+25^616+25^614+45^613+35^612+25^611+35^610+35^608+25^607+35^606+45^605+45^604+15^603+45^602+15^600+35^598+45^597+35^595+35^594+15^593+35^592+45^590+35^588+25^587+25^586+45^585+15^584+15^583+25^581+45^578+45^577+25^576+25^575+15^574+25^573+45^571+45^568+35^567+25^566+35^565+35^562+25^561+35^560+25^558+25^556+25^555+45^554+45^553+45^550+45^549+25^546+25^544+35^543+35^542+35^541+35^540+25^539+25^538+25^537+35^536+25^535+15^534+45^533+45^532+15^531+25^530+25^529+25^528+15^527+25^525+25^524+15^523+35^522+35^521+25^519+15^516+35^515+45^514+35^513+25^512+25^510+35^509+35^508+25^506+25^505+25^504+25^503+15^499+25^498+15^497+25^495+15^494+35^493+35^490+25^489+45^488+25^486+45^485+35^484+25^483+25^482+45^481+15^480+15^479+25^478+35^477+45^475+45^474+45^473+25^472+45^471+45^470+35^469+45^468+45^467+25^466+35^465+45^464+35^463+25^461+25^459+25^458+45^457+35^455+45^454+25^453+45^450+45^449+45^448+25^446+15^445+45^443+45^442+25^438+45^437+45^436+35^435+15^434+45^433+35^432+35^431+15^430+35^429+45^428+35^427+45^425+15^424+45^423+25^422+35^420+25^419+35^418+45^417+15^413+15^411+15^410+25^409+15^408+25^407+35^406+25^405+35^404+45^403+35^402+45^401+45^400+15^399+35^398+25^397+45^396+35^395+35^394+45^393+15^392+25^390+25^389+25^387+25^386+35^384+15^383+35^382+25^381+45^379+15^378+25^376+25^375+25^374+15^371+25^370+35^368+25^367+15^366+45^365+35^364+25^362+45^361+35^359+25^358+25^357+15^356+35^355+25^354+15^353+15^350+25^349+25^348+15^347+15^346+15^344+15^343+35^342+15^341+35^340+15^339+15^337+35^336+45^335+35^334+15^332+25^331+15^330+15^329+25^327+25^326+45^325+45^324+15^323+25^319+25^317+35^316+15^313+25^311+15^309+15^308+35^304+15^303+15^302+25^301+15^300+35^299+25^298+15^297+25^296+35^295+45^294+35^293+35^292+15^291+25^290+35^289+45^287+25^286+35^285+25^284+35^282+15^281+15^280+25^279+35^278+45^277+35^276+45^275+25^274+45^273+45^272+45^270+25^268+35^266+45^265+25^264+25^263+25^261+25^260+15^259+15^258+45^257+45^256+35^255+35^253+25^251+45^249+45^248+15^247+25^244+45^243+35^242+45^241+45^240+35^239+35^238+25^235+45^234+45^233+25^232+15^231+45^230+45^229+45^228+45^227+35^225+25^224+45^222+35^221+15^220+25^219+35^218+45^216+25^214+35^213+45^211+15^210+15^209+45^208+25^207+15^206+45^205+45^204+45^203+15^202+35^201+25^197+45^194+35^193+45^192+25^191+15^190+45^189+15^187+45^186+15^184+25^183+25^182+25^180+25^178+35^177+25^171+15^170+15^169+25^168+45^166+35^165+35^164+15^163+45^160+15^158+35^157+35^156+25^155+35^154+35^153+25^152+15^151+15^150+15^149+35^148+35^147+15^146+35^145+35^144+25^143+25^142+15^141+45^140+25^139+45^138+25^137+25^136+35^134+25^133+45^132+25^131+35^129+25^128+35^127+15^126+25^124+35^123+25^122+25^121+15^120+15^118+45^116+45^115+15^114+45^113+25^111+15^110+15^109+25^107+35^106+45^105+15^104+35^102+25^100+35^99+35^98+35^97+45^96+45^95+25^93+15^91+45^90+45^89+15^87+45^86+35^84+25^83+45^80+25^79+35^78+25^76+35^75+45^74+35^73+15^72+25^71+45^70+45^69+35^67+45^66+35^65+45^64+15^63+45^62+35^61+45^60+15^59+35^57+25^56+25^55+45^54+35^53+25^52+35^50+25^48+35^47+35^46+45^45+35^44+35^43+35^42+35^41+15^40+25^39+25^38+35^37+25^36+25^33+15^32+45^31+15^30+35^29+15^28+35^27+15^26+15^25+15^24+25^23+15^22+35^21+25^20+45^19+25^18+35^17+25^15+45^13+45^12+15^10+25^9+35^8+25^7+25^6+25^4+45^3+35^2+15^1+4*5^0

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