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

Ex Input:
Sentence: 'a suitcase is sitting on a sidewalk near trees'. Replace the letter 's' with 'd' in the sentence.

Ex Output:
a duitcade id ditting on a didewalk near treed


Ex Input:
Sentence: 'a row of lawn chairs with umbrellas over them'. Replace the letter 'e' with 'x' in the sentence.

Ex Output:
a row of lawn chairs with umbrxllas ovxr thxm


Ex Input:
Sentence: 'a man holding  camera with a hands free umbrella on his head'. Replace the letter 'a' with 'q' in the sentence.

Ex Output:

q mqn holding  cqmerq with q hqnds free umbrellq on his heqd