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

Example Input: Sentence: 'commuter trains on tracks next to paved platform'. Replace the letter 'm' with 'w' in the sentence.
Example Output: cowwuter trains on tracks next to paved platforw

Example Input: Sentence: 'a toaster oven painted on the side of a wall'. Replace the letter 'e' with 'p' in the sentence.
Example Output: a toastpr ovpn paintpd on thp sidp of a wall

Example Input: Sentence: 'a laptop is sitting on someone's lap with a dog laying down nearby'. Replace the letter 't' with 'v' in the sentence.
Example Output:
a lapvop is sivving on someone's lap wivh a dog laying down nearby