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

Input: Consider Input: Sentence: 'a book shelf full of books and nick nacks '. Replace the letter 'o' with 'm' in the sentence.

Output: a bmmk shelf full mf bmmks and nick nacks 


Input: Consider Input: Sentence: 'a man sitting on a luggage cart inside of an airport'. Replace the letter 't' with 'a' in the sentence.

Output: a man siaaing on a luggage cara inside of an airpora


Input: Consider Input: Sentence: 'two children struggle over a bat in their playroom'. Replace the letter 't' with 'v' in the sentence.


Output: vwo children svruggle over a bav in vheir playroom