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

D1=[]
D2=[]

for i in range(LEN):
    if S[i:i+3]=="phn":
        ind=i+3
        while S[ind:ind+2]=="om":
            ind+=2
            while S[ind]=="e" or S[ind]=="h":
                ind+=1

        #print(i,ind)

        D1.append((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
                while S[ind2]=="e" or S[ind2]=="h":
                    ind2+=1

            if (ind2-i)//2>0:
                D2.append((ind2-i)//2)

if D1==[] and D2==[]:
    if "e" in S:
        print(2)
    elif "h" in S:
        print(1)
    else:
        print(0)
else:
    if D2==[]:
        print(sum(D1)+max(D1)+1)
    elif D1==[]:
        print(sum(D2)+max(D2)+2)
    else:
        if max(D1)>max(D2):
            print(sum(D1)+sum(D2)+max(D1)+1)
        else:
            print(sum(D1)+sum(D2)+max(D2)+2)