//my name is methos
#include<iostream>
#include<cstdio>
#include<cstring>
using namespace std;
int a[2], b[2];
int main ()
{
for (int i=1;i<=2;i++)
    scanf ("%d", &a[i]);

for (int i=1;i<=2;i++)
{
     b[i] = a[i] % 10;
     b[i] = b[i] * 10000;
     b[i] = b[i] + (a[i] % 100 - (a[i] % 10)) *100;
     b[i] = b[i] + ((a[i] % 1000 - (a[i] % 100)));
     b[i] = b[i] / 100    ;
}
if (b[1] <= b[2]) printf ("%d", b[2]);
if (b[2] < b[1]) printf("%d", b[1]);
//system("pause");
return 0;
}