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

Example Input: Sentence: 'a black and white photo of a bird clouds sand and water'. Replace the letter 'b' with 'p' in the sentence.
Example Output: a plack and white photo of a pird clouds sand and water

Example Input: Sentence: 'sliced pizza served on plate next to beverage at table'. Replace the letter 'n' with 'y' in the sentence.
Example Output: sliced pizza served oy plate yext to beverage at table

Example Input: Sentence: 'a brown chair sitting beside a bard with a bench and a ladder'. Replace the letter 'r' with 'm' in the sentence.
Example Output:
a bmown chaim sitting beside a bamd with a bench and a laddem