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

[EX Q]: Sentence: 'a herd of black cattle grazing and lounging in a green field'. Replace the letter 'a' with 'q' in the sentence.
[EX A]: q herd of blqck cqttle grqzing qnd lounging in q green field

[EX Q]: Sentence: 'a group of men sitting at a desk with lap top computers'. Replace the letter 'p' with 'z' in the sentence.
[EX A]: a grouz of men sitting at a desk with laz toz comzuters

[EX Q]: Sentence: 'a close up view of a yellow tennis ball'. Replace the letter 't' with 'x' in the sentence.
[EX A]:
a close up view of a yellow xennis ball