#include <stdio.h>

int main(void){
    int a0, b0, c0, a1, b1, c1;
    scanf("%d.%d.%d", &a0, &b0, &c0);
    scanf("%d.%d.%d", &a1, &b1, &c1);
    if(a1<a0){
        printf("YES\n");
    }else if(a1==a0){
        if(b1<b0){
            printf("YES\n");
        }else if(b1==b0){
            if(c1<=c0){
                printf("YES\n");
            }else{
                printf("NO\n");
            }
        }else{
            printf("NO\n");
        }
    }else{
        printf("NO\n");
    }
    return 0;
}