#!/usr/bin/env python3

import re
import sys
import time

s = sys.stdin.read()

ans = set(re.findall(r'[\w]+', s.lower()))  # convert answer to lowercase
ans.difference_update({'e', 'a', 'o', 'planeta', 'planetas'})  # ignore words

# correct set of planets
planets = {'mercúrio', 'vénus', 'terra'}

correct = set.intersection(ans, planets)     # the ones I got right
wrong = set.difference(ans, planets)         # the ones I got wrong

grade = (len(correct) - len(wrong)) / len(planets)

comments = 'Certo' if grade == 1.0 else 'as iniciais dos planetas são M, V e T'

out = f'''---
grade: {grade}
comments: {comments}'''

time.sleep(5)

print(out)