#!/usr/bin/env python3
def correct_sentence(text: str) -> str:
text_list = [x for x in text]
text_list[0] = text_list[0].upper()
if text_list[-1:] != '.':
text_list.append('.')
return ''.join(text_list)
print(correct_sentence('greetings, friends'))
print(correct_sentence('greetings, friends.'))
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