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

Example Input: Sentence: 'the tennis player throws her racket in celebration'. Replace the letter 't' with 'l' in the sentence.
Example Output: lhe lennis player lhrows her rackel in celebralion

Example Input: Sentence: 'a group of three giraffes standing around a fence'. Replace the letter 't' with 'a' in the sentence.
Example Output: a group of ahree giraffes saanding around a fence

Example Input: Sentence: 'a brown horse being hugged by a woman'. Replace the letter 'g' with 'w' in the sentence.
Example Output:
a brown horse beinw huwwed by a woman