8_word_encounter

import re


filter_input = input()
letter, needed_count = filter_input[0], int(filter_input[1])
filtered_words = []

while True:
    sentence = input()
    if sentence == "end":
        break

    if re.match(r'^[A-Z].*[.!?]$', sentence):
        words = re.findall(r'\w+', sentence)
        for word in words:
            count = sum(1 for char in word if char == letter)
            if count >= needed_count:
                filtered_words.append(word)


print(", ".join(filtered_words))