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

Example Input: Sentence: 'a woman is talking on her white phone'. Replace the letter 'w' with 'r' in the sentence.
Example Output: a roman is talking on her rhite phone

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: 'a large street sign on a pole over a street'. Replace the letter 'n' with 't' in the sentence.
Example Output:
a large street sigt ot a pole over a street