#include <iostream>

int main ()
{
    int a,b,c=0,d=0;
    scanf("%d %d", &a,&b);
    while (a>0)
    {
          c=(c+a%10)*10;
          a=a/10;
    }
    while (b>0)
    {
          d=(d+b%10)*10;
          b=b/10;
    }
    if (c>d) printf("%d\n", c/10);
    else printf("%d\n", d/10);
    return 0;
}