#include <iostream>

int main()

{
    int a,b;
    scanf ("%d %d",&a,&b);
    int c,e;
    c=0;
    e=0;
    int d;
    while (a>0)
    {
          d=a%10;
          c=c*10+d;
          a=a/10;
    }
    int t=0;
    while (b>0)
    {
          d=b%10;
          e=e*10+d;
          b=b/10;
    }
    if (c>e) printf ("%d",c);
    else printf ("%d",e);
    //system ("PAUSE");
    return 0;
}