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

Example Input: Sentence: 'adult man on grassy field playing disc game'. Replace the letter 'n' with 'l' in the sentence.
Example Output: adult mal ol grassy field playilg disc game

Example Input: Sentence: 'the living room is designed with brown and beige colors'. Replace the letter 'i' with 'b' in the sentence.
Example Output: the lbvbng room bs desbgned wbth brown and bebge colors

Example Input: Sentence: 'a black motorcycle parked next to other motorcycles'. Replace the letter 'o' with 'u' in the sentence.
Example Output:
a black muturcycle parked next tu uther muturcycles