TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a giraffe and a zebra stare at each other'. Replace the letter 'g' with 'l' in the sentence.

SOLUTION: a liraffe and a zebra stare at each other

PROBLEM: Sentence: 'a city street with cars and busses near buildings'. Replace the letter 'e' with 'd' in the sentence.

SOLUTION: a city strddt with cars and bussds ndar buildings

PROBLEM: Sentence: 'a woman standing behind a bicycle with flowers in the basket'. Replace the letter 'o' with 'q' in the sentence.

SOLUTION:
a wqman standing behind a bicycle with flqwers in the basket