#include<iostream> #include<cstdio> #include<cstdlib> #include<cstring> using namespace std; int main(){ char a[200]={},b[200]={}; int a1[200]={},b1[200]={},c[200],lena,lenb,lenc; cin>>a>>b; lena=strlen(a); lenb=strlen(b); for(int i=0;i<lena;i++){ a1[i]=a[lena-1-i]-'0';//-48 } for(int i=0;i<lenb;i++){ b1[i]=b[lenb-1-i]-'0';//-48 } int x=0; for(int i=0;i<max(lena,lenb);i++){ c[i]=a1[i]-b1[i]+x; c[i]+=10; c[i+1]-=10; c[i]=c[i]%10; x=c[i]/10; } lenc=max(lena,lenb); c[lenc]=x; if(x==0){ lenc=lenc-1; } int k=0; for(int i=lenc;i>=0;i--){ if(c[i]==0){ for(int j=0;j<=200-i-1;j++){ if(c[j+i]=0){ k=0; } else{ k=1; break; } } if(k=0){ continue; } } cout<<c[i]; } return 0; }