//Matija Herceg
#include<iostream>
#include<cmath>
#include<cstring>
#include<cstdio>
#include<cstdlib>
#include<vector>
#include<fstream>
#include<string>
#include<algorithm>
#include<list>
using namespace std;
char a[3]; char b[3];
       


int main(){
    cin>>a>>b;
    char rj='c';
    for (int i=2; i>=0; i--){
        if (a[i]>b[i]) rj='a';
        else
        if (b[i]>a[i]) rj='b';
        else
        continue;
        break;
    }
    if (rj=='a'){
                 for (int i=2; i>=0; i--){
                     cout<<a[i];
                 }}
    else{
                 for (int i=2; i>=0; i--){
                     cout<<b[i];
                 }}
    //system("pause");
    return 0;
}