高-高

#include<iostream>
#include<vector>
using namespace std;
int main(){
	string s;
    cin>>s;
    vector<int> a,b;
    for(int i=s.size()-1;i>-1;i--){
        a.push_back(s[i]-'0');
    }
    cin>>s;
    for(int j=s.size()-1;j>-1;j--){
        b.push_back(s[j]-'0');
    }
    int sam=0;
    vector<int> d(a.size(),0);
	for(int i=0;i<a.size()||b[i];i++){
        if(i>=b.size()){
        	b[i]=0;
		}
		if(a[i]<b[i]&&i+1<a.size()){
			a[i]+=10;
			a[i+1]-=1;
		}
		d[i]=a[i]-b[i];
	}
    while(d.size()>1&&d.back()==0){
        d.pop_back();
    }
    for(int i=d.size()-1;i>=0;i--){
        cout<<d[i];
    }
    return 0;
}