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

Input: Consider Input: Sentence: 'a brown door  that says gentlemen and a toilet'. Replace the letter 'o' with 'f' in the sentence.

Output: a brfwn dffr  that says gentlemen and a tfilet


Input: Consider Input: Sentence: 'a mobile phone and a set of keys on a key chain'. Replace the letter 's' with 'j' in the sentence.

Output: a mobile phone and a jet of keyj on a key chain


Input: Consider Input: Sentence: 'a man puts a toothbrush in his mouth'. Replace the letter 's' with 'b' in the sentence.


Output: a man putb a toothbrubh in hib mouth