1
s = input()
2
need = 'hello'
3
last = -1
4
result = 'YES'
5
 
6
for x in need:
7
    ok = False
8
    for i in range(last + 1, len(s)):
9
        if s[i] == x:
10
            ok = True
11
            last = i
12
            break
13
    
14
    if ok == False:
15
        result = 'NO'
16
        break
17
 
18
print(result)