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

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 fire hydrant and a rolled up fire hose'. Replace the letter 'd' with 's' in the sentence.
a fire hysrant ans a rolles up fire hose

Sentence: 'a group of mopeds is parked in a parking lot'. Replace the letter 'a' with 'o' in the sentence.

o group of mopeds is porked in o porking lot