A_Ultra_Fast_Mathematician.cpp

#include<bits/stdc++.h>
using namespace std;

int main(){
    string s1, s2;
    cin >> s1 >> s2;
    if(s1.length() == s2.length()){
        for(int i = 0; i < s1.length(); i++){
            if(s1[i] == s2[i]){
                cout << 0;
            }else{
                cout << 1;
            }
        }
    }
}