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

Example Input: Sentence: 'a batter is batting at a baseball game'. Replace the letter 'b' with 'e' in the sentence.
Example Output: a eatter is eatting at a easeeall game

Example Input: Sentence: 'a silly cow licking the camera through a fence'. Replace the letter 't' with 'v' in the sentence.
Example Output: a silly cow licking vhe camera vhrough a fence

Example Input: Sentence: 'a little girl that is standing on a surfboard in the water'. Replace the letter 'f' with 'o' in the sentence.
Example Output:
a little girl that is standing on a suroboard in the water