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

Example Input: Sentence: 'a giraffe leaning over a fence from inside it's pasture'. Replace the letter 'n' with 'l' in the sentence.
Example Output: a giraffe lealilg over a felce from ilside it's pasture

Example Input: Sentence: 'a black and white picture of a hitter awaiting a pitch while a teammate stands in the on deck circle'. Replace the letter 'a' with 'm' in the sentence.
Example Output: m blmck mnd white picture of m hitter mwmiting m pitch while m temmmmte stmnds in the on deck circle

Example Input: Sentence: 'two men smiling with ties and collar shirts on'. Replace the letter 's' with 'd' in the sentence.
Example Output:
two men dmiling with tied and collar dhirtd on