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

Sentence: 'a group of sheep is standing in a grassy field'. Replace the letter 'g' with 'p' in the sentence.
a proup of sheep is standinp in a prassy field

Sentence: 'a person and a dog are on a bench'. Replace the letter 'e' with 'r' in the sentence.
a prrson and a dog arr on a brnch

Sentence: 'a couple of cows are grazing on the grass outside'. Replace the letter 'a' with 't' in the sentence.

t couple of cows tre grtzing on the grtss outside

