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.
s = str(input())
for i in range(len(s)):
    if s[i] != 'h' or s[i] != 'e' or s[i] != 'l' or s[i] != 'o':
        s.replace(s[i], '')
h_found = False
e_found = False
first_l_found = False
second_l_found = False
o_found = False

for i in range(len(s)):
    if s[i] == 'h':
        h_found = True
        continue
    if s[i] == 'e' and h_found == True:
        e_found = True
        continue
    if s[i] == 'l' and e_found == True:
        first_l_found = True
        continue 
    if s[i] == 'l' and first_l_found == True:
        second_l_found = True
        continue 
    if s[i] == 'o' and second_l_found == True:
        o_found = True
        break

if o_found == True:
    print('YES')
else:
    print('NO')