#include <iostream>
#include<vector>
#include<cstring>
#include<stdio.h>
using namespace std;
int main (){
    
char a[3];
char b[3];
    scanf("%s",&a);
    scanf("%s",&b);
    char x=a[2];
    char y=a[0];
    a[0]=x;
    a[2]=y;
    char k=b[2];
    char l=b[0];
    b[0]=k;
    b[2]=l;

    
  if(a>b)
  {cout<<a<<endl;}
  else
  {cout<<b<<endl;}
    



//system("pause");
return 0;
}