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

Sentence: 'a group of men sitting at a desk with lap top computers'. Replace the letter 'p' with 'z' in the sentence.
a grouz of men sitting at a desk with laz toz comzuters

Sentence: 'closeup of two teddy bears in red scarves and a brown teddy bear'. Replace the letter 'i' with 'y' in the sentence.
closeup of two teddy bears yn red scarves and a brown teddy bear

Sentence: 'a couple sits on a bench in the countryside'. Replace the letter 'y' with 'k' in the sentence.

a couple sits on a bench in the countrkside