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

Ex Input:
Sentence: 'a couple of kids laying in bed together'. Replace the letter 'o' with 'v' in the sentence.

Ex Output:
a cvuple vf kids laying in bed tvgether

Ex Input:
Sentence: 'a man in black shirt laying on bed with a teddy bear'. Replace the letter 'd' with 'b' in the sentence.

Ex Output:
a man in black shirt laying on beb with a tebby bear

Ex Input:
Sentence: 'a zebra patterned set of hair brushes sitting on each other'. Replace the letter 'r' with 'a' in the sentence.

Ex Output:
a zebaa patteaned set of haia baushes sitting on each othea