#include <stdio.h>
int main(){
    //input
    int ver1[3];
    int ver2[3];
    scanf("%d.%d.%d",&ver1[0],&ver1[1],&ver1[2]);
    scanf("%d.%d.%d",&ver2[0],&ver2[1],&ver2[2]);

    //ouput
    for (int i = 0;i < 3;i++){
        if (ver1[i] < ver2[i]){
            printf("NO\n");
            break;
        }else if (ver1[i] > ver2[i]){
            printf("YES\n");
            break;
        }else{
            if (i == 2){
                printf("YES\n");
            }
        }
    }
    return 0;
}