61A.Ultra-Fast_Mathematician.cpp

#include <bits/stdc++.h>
using namespace std;

int main()
{
    string n,m;
    cin>>n>>m;
    for(int i = 0;  i<n.size(); i++)
    {
        if(n[i] == m[i])
        {
            n[i] = '0';
        }
        else
        {
            n[i] = '1';
        }
    }

    cout<<n<<endl;
    return 0;
}