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

Ex Input:
Sentence: 'there are peoople standign next to a bike'. Replace the letter 'o' with 't' in the sentence.

Ex Output:
there are pettple standign next tt a bike

Ex Input:
Sentence: 'a man who is surfing in a wave in the ocean'. Replace the letter 'a' with 'u' in the sentence.

Ex Output:
u mun who is surfing in u wuve in the oceun

Ex Input:
Sentence: 'young boy leaping into air with tennis racket with dog below him'. Replace the letter 't' with 'r' in the sentence.

Ex Output:
young boy leaping inro air wirh rennis racker wirh dog below him