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

Ex Input:
Sentence: 'a young boy riding his skateboard down the sidewalk'. Replace the letter 'd' with 'p' in the sentence.

Ex Output:
a young boy riping his skateboarp pown the sipewalk


Ex Input:
Sentence: 'a number of people sitting on chairs near each other'. Replace the letter 'c' with 'm' in the sentence.

Ex Output:
a number of people sitting on mhairs near eamh other


Ex Input:
Sentence: 'a man is flying in the air on his skiis'. Replace the letter 'h' with 'y' in the sentence.

Ex Output:

a man is flying in tye air on yis skiis