#include <cstdio>
#include <iostream>
#include <cmath>
#include <ctime>

using namespace std;

int main (){
    string a, b;
    cin >> a >> b;
    swap(a[0], a[2]);
    swap(b[0], b[2]);
    if(b.compare(a)==-1) cout << a;
    else if(a.compare(b)==-1) cout << b;
    else cout << a;
    
    cout << endl;

    return 0;
}