#include <bits/stdc++.h>
using namespace std;
int main()
{
	int a,k;
	string b;
	cin>>a>>b;
	k=b.size();
	for(int i=k;i>=0;i--)
	{
		if(b[i]==0)
		  continue;
		cout<<b[i];
		else
		  if(i==0)
		    cout<<b[i]<<"*"<<a<<"^"<<i;
		  else
		    cout<<b[i]<<"*"<<a<<"^"<<i<<"+";
	}
	return 0;
}