#include<bits/stdc++.h> using namespace std; char a[51],b[51]; int main(){ cin>>a>>b; int bl = strlen(b); int al = strlen(a); for(int i=0;i<=al-1;i++){ if(a[i]==b[i]){ cout<<"1"; } else if(a[i]!=b[i]){ cout<<"0"; } } return 0; }