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

Example Input: Sentence: 'a woman and man both inspecting their cellphones'. Replace the letter 'e' with 'h' in the sentence.
Example Output: a woman and man both insphcting thhir chllphonhs

Example Input: Sentence: 'three men in a park playing a sport'. Replace the letter 'p' with 'w' in the sentence.
Example Output: three men in a wark wlaying a swort

Example Input: Sentence: 'a sandy beach topped with lots of people and tens'. Replace the letter 'e' with 'n' in the sentence.
Example Output:
a sandy bnach toppnd with lots of pnopln and tnns