TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a herd of black cattle grazing and lounging in a green field'. Replace the letter 'a' with 'q' in the sentence.

SOLUTION: q herd of blqck cqttle grqzing qnd lounging in q green field

PROBLEM: Sentence: 'broccoli and cooked meat arranged on a plate'. Replace the letter 'c' with 'l' in the sentence.

SOLUTION: brolloli and looked meat arranged on a plate

PROBLEM: Sentence: 'showing two bathroom stalls, one squat and one sit'. Replace the letter 'e' with 'b' in the sentence.

SOLUTION:
showing two bathroom stalls, onb squat and onb sit