#include <iostream>

using namespace std;
int a,b,c,d,e;
int main(void) {
    cin >> a >> b;
    c=c+a%10*100;
    a=a/10;
    c=c+a%10*10;
    a=a/10;
    c=c+a%10;
    d=d+b%10*100;
    b=b/10;
    d=d+b%10*10;
    b=b/10;
    d=d+b%10;
    if(c>=d) cout << c << endl;
    else
    cout << d << endl;
    return 0;
    }