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: 'a city street at dusk time with traffic'. Replace the letter 'i' with 'm' in the sentence.
Example Output: a cmty street at dusk tmme wmth traffmc

Example Input: Sentence: 'people laying on surf boards in the ocean'. Replace the letter 'd' with 'r' in the sentence.
Example Output:
people laying on surf boarrs in the ocean