S=input()
S+="z"*100

def ope1(SCORE,S):
    T=""
    i=0
    while i<len(S):
        if S[i:i+5]=="phnom":
            T+="pehn"
            i+=5
            SCORE+=1
        else:
            T+=S[i]
            i+=1
    return SCORE,T

def ope2(SCORE,S):
    T=""
    for s in S:
        if s=="h":
            continue
        if s=="e":
            T+="h"
        else:
            T+=s
    if S==T:
        return SCORE,S
    else:
        return SCORE+1,T
    
SCORE=0
SCORE,S=ope1(SCORE,S)
SCORE,S=ope2(SCORE,S)
SCORE,S=ope1(SCORE,S)
SCORE,S=ope2(SCORE,S)
SCORE,S=ope1(SCORE,S)
SCORE,S=ope2(SCORE,S)

LEN=len(S)

L=[]
for i in range(LEN):
    if S[i:i+3]=="phn":
        s=0
        j=i+3
        while S[j:j+2]=="om":
            s+=1
            j+=2
        L.append(s)

if L==[]:
    print(SCORE)
else:
    print(SCORE+max(L)+sum(L)+1)