#include <stdio.h>
#include <string.h>

int main () {
  char a[6][102] = {};
  
  int res = 0;
  
  res = scanf("%s", a[0]);
  res = scanf("%s", a[1]);
  res = scanf("%s", a[2]);
  res = scanf("%s", a[3]);
  res = scanf("%s", a[4]);
  res = scanf("%s", a[5]);
  
  if (strcmp(a[0], a[2]) != 0 || strcmp(a[1], a[2]) != 0 || strcmp(a[3], a[5]) != 0 || strcmp(a[4], a[5]) != 0) {
    printf("YES\n");
  } else {
    printf("NO\n");
  }
  
  return 0;
}