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

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

Ex Output:
an airpsane moves through the skies above a snowy mountain range

Ex Input:
Sentence: 'a white nerd with a tie around his sweater'. Replace the letter 'i' with 'q' in the sentence.

Ex Output:
a whqte nerd wqth a tqe around hqs sweater

Ex Input:
Sentence: 'an orange cat that is laying on a keyboard'. Replace the letter 'n' with 'm' in the sentence.

Ex Output:
am oramge cat that is layimg om a keyboard