#include <bits/stdc++.h>   using namespace std;   int main() {     string ch1, ch2, ch3;     getline(cin, ch1);     getline(cin, ch2);     for (int s = 0; s < ch1.size(); s++) {       if (ch1[s] != ch2[s]) {         ch3 +=  1 ;       } else {         ch3 +=  0 ;       }     }     cout << ch3 <<   n ;     return 0;   }   