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

Input: Consider Input: Sentence: 'a baseball player running to third base from second'. Replace the letter 'a' with 'u' in the sentence.

Output: u busebull pluyer running to third buse from second


Input: Consider Input: Sentence: 'a small train is on the tracks by a house'. Replace the letter 'l' with 'x' in the sentence.

Output: a smaxx train is on the tracks by a house


Input: Consider Input: Sentence: 'a conference room full of tables with laptops'. Replace the letter 'p' with 'v' in the sentence.


Output: a conference room full of tables with lavtovs