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

Example Input: Sentence: 'a bathroom with a make shift shower curtain'. Replace the letter 'w' with 's' in the sentence.
Example Output: a bathroom sith a make shift shoser curtain

Example Input: Sentence: 'commuter trains on tracks next to paved platform'. Replace the letter 'm' with 'w' in the sentence.
Example Output: cowwuter trains on tracks next to paved platforw

Example Input: Sentence: 'a boy taking a nap with his dog on a bed'. Replace the letter 'o' with 'i' in the sentence.
Example Output:
a biy taking a nap with his dig in a bed