#include<stdio.h>
main(){
    int A,B,C;
    int f,s;

    scanf("%d.%d.%d",&A,&B,&C);
    f = A*1000000+B*1000+C;
    scanf("%d.%d.%d",&A,&B,&C);
    s = A*1000000+B*1000+C;
    printf("%s\n",f<s?"NO":"YES");
}