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

int main()
{

    int ka,kb,kc;
    scanf("%i.%i.%i",&ka,&kb,&kc);

    int a,b,c;
    scanf("%i.%i.%i",&a,&b,&c);

    char ans[256] = "NO";

    if (ka>a)
        strcpy(ans, "YES");
    else if(ka==a) {
        if (kb>b)
            strcpy(ans, "YES");
        else if(kb==b){
            if (kc>=c)
                strcpy(ans, "YES");
        }
    }

    printf("%s",ans);
    return 0;
}