A_Ultra_Fast_Mathematician.cpp

#include<bits/stdc++.h>

using namespace std;

int main() {
    string str1, str2, result="";
    cin>>str1>>str2;

    for(int i =0; i< str1.length() ; i++){
        if(str1[i]!=str2[i])
            result = result + '1';
        else
            result = result + '0';
    }
    cout<<result<<endl;
}