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

Example Input: Sentence: 'batter is twisted up as he took a swing at the baseball'. Replace the letter 'h' with 'i' in the sentence.
Example Output: batter is twisted up as ie took a swing at tie baseball

Example Input: Sentence: 'traffic congestion with cars and an electric tram'. Replace the letter 'a' with 'k' in the sentence.
Example Output: trkffic congestion with ckrs knd kn electric trkm

Example Input: Sentence: 'a man is smiling as he stands in the middle of the snowy forest on his skies'. Replace the letter 'm' with 'z' in the sentence.
Example Output:
a zan is sziling as he stands in the ziddle of the snowy forest on his skies