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

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: 'wooden park bench sitting between two trees with grassy background'. Replace the letter 'i' with 'q' in the sentence.
Example Output: wooden park bench sqttqng between two trees wqth grassy background

Example Input: Sentence: 'a baseball team and spectators during a baseball game'. Replace the letter 'b' with 'o' in the sentence.
Example Output:
a oaseoall team and spectators during a oaseoall game