ultra_fast_mathematics.cpp

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

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