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

Ex Input:
Sentence: 'a double decker bus stopped outside a station on a street'. Replace the letter 'c' with 'y' in the sentence.

Ex Output:
a double deyker bus stopped outside a station on a street


Ex Input:
Sentence: 'lose up of various trays of croissants and muffins'. Replace the letter 'n' with 'f' in the sentence.

Ex Output:
lose up of various trays of croissafts afd muffifs


Ex Input:
Sentence: 'several graffias near a man and a child'. Replace the letter 'c' with 'r' in the sentence.

Ex Output:

several graffias near a man and a rhild