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

D1=0
D2=0

for i in range(LEN):
    if S[i:i+3]=="phn":
        ind=i+3
        while S[ind:ind+2]=="om":
            ind+=2

        #print(i,ind)

        D1=max(D1,(ind-(i+3))//2)

for i in range(LEN):
    if S[i:i+2]=="om":
        ind=i-1
        while ind>=0 and S[ind]=="h":
            ind-=1

        #print(i,ind)

        if S[ind-2:ind+1]=="pen":

            ind2=i

            while S[ind2:ind2+2]=="om":
                ind2+=2

            D2=max(D2,(ind2-i)//2)
            
ANS=max(D1*2+1,D2*2+2)

if ANS==0:
    if "e" in S:
        print(2)
    elif "h" in S:
        print(1)
    else:
        print(0)
else:
    print(ANS)