In this task, you need to replace a letter in the sentence with another given letter.

Input: Consider Input: Sentence: 'a tower type building structure with a large clock and many windows in front of a cloudy blue sky'. Replace the letter 'n' with 'x' in the sentence.

Output: a tower type buildixg structure with a large clock axd maxy wixdows ix froxt of a cloudy blue sky


Input: Consider Input: Sentence: 'a crowd stands under a set of lights in the ceiling and one person holds up a cell phone'. Replace the letter 'r' with 'f' in the sentence.

Output: a cfowd stands undef a set of lights in the ceiling and one pefson holds up a cell phone


Input: Consider Input: Sentence: 'an old white car driving through a busy intersection'. Replace the letter 'g' with 'm' in the sentence.


Output: an old white car drivinm throumh a busy intersection