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

Sentence: 'a couple of people that are petting a horse'. Replace the letter 'e' with 'p' in the sentence.
a couplp of ppoplp that arp pptting a horsp

Sentence: 'a zebra is eating hay in a fenced enclosure'. Replace the letter 'e' with 'i' in the sentence.
a zibra is iating hay in a fincid inclosuri

Sentence: 'the little boy is walking along the grass'. Replace the letter 't' with 'q' in the sentence.

qhe liqqle boy is walking along qhe grass