#include <iostream>
#include <string>
#include <cstdio>
#include <cmath>
#include <cstring>
#include <algorithm>
#include <vector>
#include <queue>
#define range(i,a,b) for(int i=a;i<=b;++i)
#define rerange(i,a,b) for(int i=a;i>=b;--i)
#define LL long long
#define CLSINF(arr) memset(arr,0x7f7f7f7f,sizeof(arr))
#define CLS(arr) memset(arr,0,sizeof(arr))
using namespace std;
string a,b,ans;
void init(){
cin>>a>>b;
}
void solve(){
range(i,0,a.size()-1)ans=ans+(a[i]==b[i]?'1':'0');
cout<<ans<<endl;
}
int main() {
init();
solve();
return 0;
}