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

Ex Input:
Sentence: 'a painting of scissors going to cut a chain with a lock'. Replace the letter 'g' with 'v' in the sentence.

Ex Output:
a paintinv of scissors voinv to cut a chain with a lock

Ex Input:
Sentence: 'people watching a kite being flown with a sky background'. Replace the letter 'a' with 'b' in the sentence.

Ex Output:
people wbtching b kite being flown with b sky bbckground

Ex Input:
Sentence: 'a den with a wooden floor, wall and upstairs balcony'. Replace the letter 'i' with 'm' in the sentence.

Ex Output:
a den wmth a wooden floor, wall and upstamrs balcony