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

Ex Input:
Sentence: 'a long green grain traveling past a white building'. Replace the letter 'w' with 'o' in the sentence.

Ex Output:
a long green grain traveling past a ohite building


Ex Input:
Sentence: 'a plane getting ready to land on a runway'. Replace the letter 'n' with 'o' in the sentence.

Ex Output:
a plaoe gettiog ready to laod oo a ruoway


Ex Input:
Sentence: 'a train travels through the mountains on its tracks'. Replace the letter 'a' with 'q' in the sentence.

Ex Output:

q trqin trqvels through the mountqins on its trqcks