#include <stdio.h>

int main(){
    int a, b, c;
    int d, e, f;

    scanf("%d.%d.%d\n", &a, &b, &c);
    scanf("%d.%d.%d\n", &d, &e, &f);

    if(a*1000000 + b*1000 + c >= d*1000000 + e*1000 + f){
        printf("YES\n");
    }else{
        printf("NO\n");
    }

    return 0;
}