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

Sentence: 'a woman is standing on a street curb'. Replace the letter 'a' with 't' in the sentence.
t womtn is sttnding on t street curb

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 street signs sitting on top of a metal pole'. Replace the letter 'p' with 'i' in the sentence.

a couile of street signs sitting on toi of a metal iole