#include <iostream>
using namespace std;
 
int ss (string a, string b)
{
	for (int i=2; i>=0; i--)
	{
		if (a[i]>b[i]) return 1;
		if (a[i]<b[i]) return -1;
	}
}
 
int main ()
{
	//IN;
	string a, b;
	cin>>a>>b;
	//OUT;
	if (ss(a, b)==1) for (int i=2; i>=0; i--) cout<<a[i];
	else for (int i=2; i>=0; i--) cout<<b[i];
	return 0;
}