#include <stdio.h>

int main(){
        int A0,B0,C0;
        int A1,B1,C1;
        scanf("%d.%d.%d", &A0, &B0, &C0);
        scanf("%d.%d.%d", &A1, &B1, &C1);
        if((A0*100000000+B0*100000+C0*100)>(A1*100000000+B1*100000+C1*100)){
                printf("YES\n");
        }else{
                printf("NO\n");
        }
        return 0;
}