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

int main () {
  char a[100003] = "";
  char p[100003] = "";
  char q[100003] = "";
  
  int res = 0;
  
  res = scanf("%s", a);
  res = scanf("%s", p);
  res = scanf("%s", q);
  
  if (strcmp(p, q) == 0) {
    printf("No\n");
  } else {
    printf("Yes\n");
  }
  
  return 0;
}