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: 'a white plate topped with meat and greens'. Replace the letter 's' with 'b' in the sentence.
a white plate topped with meat and greenb

Sentence: 'a youth on a skateboard moving across concrete tile with people in the background'. Replace the letter 'r' with 'z' in the sentence.

a youth on a skateboazd moving aczoss conczete tile with people in the backgzound