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

Example Input: Sentence: 'an old photo of group of people nicely dressed around the end of a long table'. Replace the letter 'e' with 'i' in the sentence.
Example Output: an old photo of group of piopli nicily drissid around thi ind of a long tabli

Example Input: Sentence: 'a hipster riding a skateboard up the side of a wall'. Replace the letter 's' with 'm' in the sentence.
Example Output: a hipmter riding a mkateboard up the mide of a wall

Example Input: Sentence: 'an animal and some other animals stand in a grassland'. Replace the letter 'a' with 'p' in the sentence.
Example Output:
pn pnimpl pnd some other pnimpls stpnd in p grpsslpnd