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

Input: Consider Input: Sentence: 'a couple walking down a sidewalk next to some graffiti'. Replace the letter 'a' with 'y' in the sentence.

Output: y couple wylking down y sidewylk next to some gryffiti


Input: Consider Input: Sentence: 'a zebra is eating hay in a fenced enclosure'. Replace the letter 'e' with 'i' in the sentence.

Output: a zibra is iating hay in a fincid inclosuri


Input: Consider Input: Sentence: 'a little baby sitting inside of a dog bed'. Replace the letter 'i' with 'm' in the sentence.


Output: a lmttle baby smttmng mnsmde of a dog bed