TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a man sitting at a table and using his laptop'. Replace the letter 'd' with 'o' in the sentence.

SOLUTION: a man sitting at a table ano using his laptop

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

SOLUTION: a woman on a call phona on  city straat

PROBLEM: Sentence: 'a two-floor bus riding along a busy road'. Replace the letter 'o' with 't' in the sentence.

SOLUTION:
a twt-flttr bus riding altng a busy rtad