一片紫

#include<bits/stdc++.h>
using namespace std;
int a[210] ,b[210];
string s1,s2;
char f;
int main(){
	cin>>s1>>s2;
	if(s1.size()<s2.size()||(s1.size()==s2.size()&&s1<s2)){
		f='-';
		swap(s1,s2);
	}
	int l1=s1.length(),l2=s2.length();
	for(int i=0;i<l1;i++)
		a[i]=s1[l1-1-i]-'0';
	for(int i=0;i<l2;i++)
		b[i]=s2[l2-1-i]-'0';
	for(int i=0;i<l1;i++){  
		if(a[i]<b[i]){
			a[i]+=10;
			a[i+1]-=1;
		}
		a[i]=a[i]-b[i];
	}
	if(f=='-')cout<<f;
	while(l1>0&&a[l1]==0)l1--;
	for(int i=l1;i>=0;i--)
		cout<<a[i];
	return 0;
}