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

Ex Input:
Sentence: 'this refrigerator is covered in stickers on it'. Replace the letter 't' with 'h' in the sentence.

Ex Output:
hhis refrigerahor is covered in shickers on ih


Ex Input:
Sentence: 'the dog lies inside a purple and white collapsable chair'. Replace the letter 'n' with 'j' in the sentence.

Ex Output:
the dog lies ijside a purple ajd white collapsable chair


Ex Input:
Sentence: 'a train engine is sitting on some train tracks'. Replace the letter 'i' with 'z' in the sentence.

Ex Output:

a trazn engzne zs szttzng on some trazn tracks