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

Input: Consider Input: Sentence: 'a motorcycle sitting on the side of the road by grass'. Replace the letter 'r' with 't' in the sentence.

Output: a mototcycle sitting on the side of the toad by gtass

Input: Consider Input: Sentence: 'a large white sign with black lettering leaning against a metal fence'. Replace the letter 'e' with 'j' in the sentence.

Output: a largj whitj sign with black ljttjring ljaning against a mjtal fjncj

Input: Consider Input: Sentence: 'people with umbrellas are going down a path in the rain towards a lighthouse'. Replace the letter 'u' with 'y' in the sentence.
Output: people with ymbrellas are going down a path in the rain towards a lighthoyse