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

Ex Input:
Sentence: 'a couple of giraffe standing next to each other'. Replace the letter 'i' with 'q' in the sentence.

Ex Output:
a couple of gqraffe standqng next to each other


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


Ex Input:
Sentence: 'a long hot dog on a roll and some dressing'. Replace the letter 'e' with 'f' in the sentence.

Ex Output:

a long hot dog on a roll and somf drfssing