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

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 shot looks down on a person riding a long board'. Replace the letter 'o' with 'u' in the sentence.

Ex Output:
a shut luuks duwn un a persun riding a lung buard


Ex Input:
Sentence: 'many piles of produce are underneath sale signs'. Replace the letter 'n' with 'r' in the sentence.

Ex Output:

mary piles of produce are urderreath sale sigrs