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

Ex Input:
Sentence: 'a group of small children sitting at a table in front of a pizza'. Replace the letter 'r' with 'd' in the sentence.

Ex Output:
a gdoup of small childden sitting at a table in fdont of a pizza


Ex Input:
Sentence: 'a plate topped with waffles, bacon and banana slices'. Replace the letter 'a' with 'k' in the sentence.

Ex Output:
k plkte topped with wkffles, bkcon knd bknknk slices


Ex Input:
Sentence: 'a black bag sitting on top of a bed in a  room'. Replace the letter 'k' with 'b' in the sentence.

Ex Output:

a blacb bag sitting on top of a bed in a  room