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

Example Input: Sentence: 'an airplane moves through the skies above a snowy mountain range'. Replace the letter 'l' with 's' in the sentence.
Example Output: an airpsane moves through the skies above a snowy mountain range

Example Input: Sentence: 'two kids sitting on a child's bed and smiling'. Replace the letter 't' with 's' in the sentence.
Example Output: swo kids sissing on a child's bed and smiling

Example Input: Sentence: 'a group of young girls playing a game of soccer'. Replace the letter 'g' with 'o' in the sentence.
Example Output:
a oroup of youno oirls playino a oame of soccer