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

Input: Consider Input: Sentence: 'a table full of various types of cellphones, pdas and pagers'. Replace the letter 's' with 'f' in the sentence.

Output: a table full of variouf typef of cellphonef, pdaf and pagerf


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: 'two boys are playing a wii video game'. Replace the letter 'i' with 'a' in the sentence.


Output: two boys are playang a waa vadeo game