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

Example Input: Sentence: 'a white plate topped with meat and greens'. Replace the letter 's' with 'b' in the sentence.
Example Output: a white plate topped with meat and greenb

Example Input: Sentence: 'two children struggle over a bat in their playroom'. Replace the letter 't' with 'v' in the sentence.
Example Output: vwo children svruggle over a bav in vheir playroom

Example Input: Sentence: 'the people hold their phone up and make hand motions at the event'. Replace the letter 'o' with 'g' in the sentence.
Example Output:
the pegple hgld their phgne up and make hand mgtigns at the event