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

Sentence: 'a man is on a saddled horse with reins'. Replace the letter 's' with 'o' in the sentence.
a man io on a oaddled horoe with reino

Sentence: 'a woman on a cell phone on city street'. Replace the letter 'e' with 'a' in the sentence.
a woman on a call phona on city straat

Sentence: 'a crowd of people close together on a street'. Replace the letter 'e' with 'q' in the sentence.
a crowd of pqoplq closq togqthqr on a strqqt