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

Ex Input:
Sentence: 'lots of luggage is jammed into the back compartment of a van'. Replace the letter 'o' with 'h' in the sentence.

Ex Output:
lhts hf luggage is jammed inth the back chmpartment hf a van


Ex Input:
Sentence: 'people wait for a train on a snowy sidewalk'. Replace the letter 'n' with 'm' in the sentence.

Ex Output:
people wait for a traim om a smowy sidewalk


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