S = list(input())

N = len(S)
ans = 0

flag = 1
phn = 0
oflag = 0
for i in range(2,N):
    if S[i-2] == 'p' and S[i-1] == 'h' and S[i] == 'n':
        phn = 1
    elif S[i] == 'o' and phn:
        oflag = 1
    elif S[i] == 'm' and oflag and phn:
        if flag:
            ans += 1
            flag = 0
        ans += 2
        oflag = 0
    else:
        oflag = 0
        phn = 0

penh = 0
oflag = 0
for i in range(3,N):
    if S[i-3] == 'p' and S[i-2] == 'e' and S[i-1] == 'n' and S[i] == 'h':
        penh = 1
    elif S[i] == 'o' and penh:
        oflag = 1
    elif S[i] == 'm' and oflag and penh:
        if flag:
            ans += 2
            flag = 0
        ans += 2
        oflag = 0
    else:
        oflag = 0
        penh = 0

print(ans)