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

Example Input: Sentence: 'a baseball player holding a bat in front of catcher and umpire'. Replace the letter 'i' with 'k' in the sentence.
Example Output: a baseball player holdkng a bat kn front of catcher and umpkre

Example Input: Sentence: 'a street light is near a large building'. Replace the letter 'n' with 'c' in the sentence.
Example Output: a street light is cear a large buildicg

Example Input: Sentence: 'a cool looking kite that is on the sand'. Replace the letter 't' with 'x' in the sentence.
Example Output:
a cool looking kixe xhax is on xhe sand