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

Ex Input:
Sentence: 'a house cat sits on an oven door, sniffing the oven racks inside'. Replace the letter 'i' with 'y' in the sentence.

Ex Output:
a house cat syts on an oven door, snyffyng the oven racks ynsyde


Ex Input:
Sentence: 'a man is posing in a desert, leaning on a sign with an image of a camel on it'. Replace the letter 'i' with 'r' in the sentence.

Ex Output:
a man rs posrng rn a desert, leanrng on a srgn wrth an rmage of a camel on rt


Ex Input:
Sentence: 'a group of people are standing on a busy street'. Replace the letter 's' with 'y' in the sentence.

Ex Output:

a group of people are ytanding on a buyy ytreet