#include <cstdlib>
#include <iostream>
#include <algorithm>
#include <cstring>
#include <string>


using namespace std;

int main(){
    string a, b;
    cin >> a >> b;
    reverse(a.begin(), a.end());
    reverse(b.begin(), b.end());
    if(atoi(a.c_str()) > atoi(b.c_str()) ) cout << a;
    else cout << b;
    cout << endl;
    scanf("\n");
    return 0;
}