#!/usr/bin/env python3

import re
import sys

s = sys.stdin.read()

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

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

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

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

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

if grade < 1.0:
    out += '\ncomments: Vou dar uma ajuda, as iniciais são M, V e T...'

print(out)
exit(0)