s = input()
n = len(s)

ans = 0
for i in range(n - 4):
    if s[i:i+4] == "penh":
        tmp = 0
        flag_o = False
        for j in range(i + 4, n):
            if s[j] == "h":
                continue
            if s[j] == "e":
                if tmp >= 1:
                    continue
                else:
                    ans = max(ans, tmp * 2 + 2)
                    break
            if s[j] == "o" and not flag_o:
                flag_o = True
                continue
            if s[j] == "m" and flag_o:
                flag_o = False
                tmp += 1
                continue
            else:
                ans = max(ans, tmp * 2 + 2)
                break
        else:
            ans = max(ans, tmp * 2 + 2)

for i in range(n - 5):
    if s[i:i+5] == "phnom":
        tmp = 0
        flag_o = False
        for j in range(i + 5, n):
            if s[j] == "h":
                continue
            if s[j] == "e":
                if tmp >= 1:
                    continue
                else:
                    ans = max(ans, tmp * 2 + 3)
                    break
            if s[j] == "o" and not flag_o:
                flag_o = True
                continue
            if s[j] == "m" and flag_o:
                flag_o = False
                tmp += 1
                continue
            else:
                ans = max(ans, tmp * 2 + 3)
                break
        else:
            ans = max(ans, tmp * 2 + 3)

if "h" in s:
    ans = max(ans, 1)
if "e" in s:
    ans = max(ans, 2)
print(ans)