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

Ex Input:
Sentence: 'a couple of people that are petting a horse'. Replace the letter 'e' with 'p' in the sentence.

Ex Output:
a couplp of ppoplp that arp pptting a horsp


Ex Input:
Sentence: 'a bike sitting parked next to a cart in front of some boxes'. Replace the letter 't' with 'x' in the sentence.

Ex Output:
a bike sixxing parked nexx xo a carx in fronx of some boxes


Ex Input:
Sentence: 'small ferry boat crossing waterway leaving a wake trail'. Replace the letter 'a' with 'h' in the sentence.

Ex Output:

smhll ferry boht crossing whterwhy lehving h whke trhil