#include<bits/stdc++.h> using namespace std; char s1[50]; char s2[50]; int n; int main(){ cin >> s1 >>s2; for(int i=0;i<=n-1;i++){ if(s1[i]==s2[i]) { cout << "1"; } if(s1[i]!=s2[i]){ cout << "0"; } } return 0; }