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

Input: Consider Input: Sentence: 'a guy looking at a tennis ball with a goofy look'. Replace the letter 'a' with 'x' in the sentence.

Output: x guy looking xt x tennis bxll with x goofy look


Input: Consider Input: Sentence: 'the big sandwich features several different  colorful ingredients'. Replace the letter 'e' with 'o' in the sentence.

Output: tho big sandwich foaturos sovoral difforont  colorful ingrodionts


Input: Consider Input: Sentence: 'a small dog runs with a toy in its mouth'. Replace the letter 'y' with 'r' in the sentence.


Output: a small dog runs with a tor in its mouth