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

Ex Input:
Sentence: 'a bathroom that has  a sink and a toilet'. Replace the letter 's' with 'a' in the sentence.

Ex Output:
a bathroom that haa  a aink and a toilet


Ex Input:
Sentence: 'the two zebras standing out in the field'. Replace the letter 'h' with 'i' in the sentence.

Ex Output:
tie two zebras standing out in tie field


Ex Input:
Sentence: 'a blanket that is on a green couch'. Replace the letter 'e' with 'z' in the sentence.

Ex Output:

a blankzt that is on a grzzn couch