#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main(void)
{
    int oldver1,oldver2,oldver3;
    int jver1,jver2,jver3;
    scanf("%d.%d.%d",&oldver1,&oldver2,&oldver3);
    scanf("%d.%d.%d",&jver1,&jver2,&jver3);
    if(oldver1>jver1)
    {
        printf("YES");
    }
    else if (oldver1<jver1)
    {
        printf("NO");
    }
    else
    {
        if(oldver2>jver2)
        {
            printf("YES");
        }
        else if (oldver2<jver2)
        {
            printf("NO");
        }
        else
        {
            if(oldver3>jver3)
            {
                printf("YES");
            }
            else if (oldver3<jver3||oldver3==jver3)
            {
                printf("NO");
            }
        }
    }
    
    
}