Vasya has recently learned to type and log on to the Internet. He immediately entered a chat room and decided to say hello to everybody. Vasya typed the word *s*. It is considered that Vasya managed to say hello if several letters can be deleted from the typed word so that it resulted in the word "hello". For example, if Vasya types the word "ahhellllloou", it will be considered that he said hello, and if he types "hlelo", it will be considered that Vasya got misunderstood and he didn't manage to say hello. Determine whether Vasya managed to say hello by the given word *s*.
The first and only line contains the word *s*, which Vasya typed. This word consisits of small Latin letters, its length is no less that 1 and no more than 100 letters.
# ------------------- fast io --------------------
import os
import sys
from io import BytesIO, IOBase


BUFSIZE = 8192


class FastIO(IOBase):
    newlines = 0

    def __init__(self, file):
        self._fd = file.fileno()
        self.buffer = BytesIO()
        self.writable = "x" in file.mode or "r" not in file.mode
        self.write = self.buffer.write if self.writable else None

    def read(self):
        while True:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            if not b:
                break
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines = 0
        return self.buffer.read()

    def readline(self):
        while self.newlines == 0:
            b = os.read(self._fd, max(os.fstat(self._fd).st_size, BUFSIZE))
            self.newlines = b.count(b"\n") + (not b)
            ptr = self.buffer.tell()
            self.buffer.seek(0, 2), self.buffer.write(b), self.buffer.seek(ptr)
        self.newlines -= 1
        return self.buffer.readline()

    def flush(self):
        if self.writable:
            os.write(self._fd, self.buffer.getvalue())
            self.buffer.truncate(0), self.buffer.seek(0)


class IOWrapper(IOBase):
    def __init__(self, file):
        self.buffer = FastIO(file)
        self.flush = self.buffer.flush
        self.writable = self.buffer.writable
        self.write = lambda s: self.buffer.write(s.encode("ascii"))
        self.read = lambda: self.buffer.read().decode("ascii")
        self.readline = lambda: self.buffer.readline().decode("ascii")


sys.stdin, sys.stdout = IOWrapper(sys.stdin), IOWrapper(sys.stdout)
input = lambda: sys.stdin.readline().rstrip("\r\n")
if os.path.exists('input.txt'):
    sys.stdin = open('input.txt','r')
    sys.stdout = open('output.txt','w')


# ------------------- fast io --------------------
from math import *
from itertools import * # chain,groupby,permutations,combinations
from collections import Counter

"""
def prod(a, mod=10**9+7):
    ans = 1
    for each in a:
        ans = (ans * each) % mod
    return ans

def lcm(a, b): return a * b // gcd(a, b)

def binary(x, length=16):
    y = bin(x)[2:]
    return y if len(y) >= length else "0" * (length - len(y)) + y


def powerset(s):
    n=len(s)
    
    return chain.from_iterable(combinations(s,r) for r in range(1,n))

def binarySearch(arr,x): 
    l=0
    r=len(arr)-1
    while l <= r: 
  
        mid = l + (r - l) // 2; 
        if arr[mid] == x: 
            return mid 
        elif arr[mid] < x: 
            l = mid + 1
        else: 
            r = mid - 1
    return -1

"""

#----#

def lcm(a, b): return a * b // gcd(a, b)

def aa(): #for int
    return(int(input()))
def bb(): #for int arr
    return(list(map(int,input().split())))
def cc():  #for string
    s = input()
    return (list(s))
def dd(): #space seperated intege
    return(map(int,input().split()))
#----#




def solve():
    s=cc()
    check = "hello"
    i=0
    j=0
    while i<len(s) and j<5:
        if s[i]==check[j]:
            i+=1
            j+=1
        else:
            i+=1

    if j==5:
        print("YES")
    else:
        print("NO")



t=1#aa()
while(t):
    solve()
    t-=1

