#include<stdio.h>

int main(void){
  int A0, B0, C0;
  int A1, B1, C1;
  int Version0, Version1;
  scanf("%d.%d.%d", &A0, &B0, &C0);
  scanf("%d.%d.%d", &A1, &B1, &C1);
  Version0 = A0 * 1000 * 1000 + B0 * 1000 + C0;
  Version1 = A1 * 1000 * 1000 + B1 * 1000 + C1;
  if(Version0 >= Version1) printf("YES\n");
  else printf("NO\n");
  return 0;
}