#include <bits/stdc++.h>
int main() {
  int i, n, l = 0;
  char a[120];
  scanf("%s", a);
  n = strlen(a);
  for (i = 0; i < n; i++) {
    if (a[i] == 'h' && l == 0)
      l++;
    else if (a[i] == 'e' && l == 1)
      l++;
    else if (a[i] == 'l' && l == 2)
      l++;
    else if (a[i] == 'l' && l == 3)
      l++;
    else if (a[i] == 'o' && l == 4)
      l++;
    if (l == 5) break;
  }
  if (l == 5)
    printf("YES\n");
  else
    printf("NO\n");
  return 0;
}
