# include<iostream> using namespace std; int main(){ char a[114],b[114]; cin>>a>>b; for(int i=0;a[i]!='\0';i++){ if(a[i]==b[i] && a[i]=='0') cout<<'1'; else if(a[i]==b[i] && a[i]=='1') cout<<'1'; else cout<<'0'; } return 0; }