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

Example Input: Sentence: 'a group of small children sitting at a table in front of a pizza'. Replace the letter 'r' with 'd' in the sentence.
Example Output: a gdoup of small childden sitting at a table in fdont of a pizza

Example Input: Sentence: 'a shot looks down on a person riding a long board'. Replace the letter 'o' with 'u' in the sentence.
Example Output: a shut luuks duwn un a persun riding a lung buard

Example Input: Sentence: 'cyclist in city traffic crossing an intersection with the light'. Replace the letter 's' with 'j' in the sentence.
Example Output:
cyclijt in city traffic crojjing an interjection with the light