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

Input: Consider Input: Sentence: 'a herd of black cattle grazing and lounging in a green field'. Replace the letter 'a' with 'q' in the sentence.

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


Input: Consider Input: Sentence: 'a couple of kids are sitting in a field'. Replace the letter 't' with 'v' in the sentence.

Output: a couple of kids are sivving in a field


Input: Consider Input: Sentence: 'a person with a backpack is cross country skiing'. Replace the letter 'i' with 'l' in the sentence.


Output: a person wlth a backpack ls cross country skllng