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.
word = input()

# 依次比较每个字母是否与"hello"中对应位置的字母相同
# 如果找到了匹配的字母，则将该字母从待匹配的单词中删除，继续匹配剩下的字母
# 最后如果待匹配的单词为空，表示成功打出了"hello"
def has_hello(word):
    hello = "hello"
    for c in word:
        if c == hello[0]:
            hello = hello[1:]
        if len(hello) == 0:
            return True
    return False

if has_hello(word):
    print("YES")
else:
    print("NO")