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

Ex Input:
Sentence: 'a close up of a train on train tracks at night'. Replace the letter 'n' with 'm' in the sentence.

Ex Output:
a close up of a traim om traim tracks at might


Ex Input:
Sentence: 'a bike sitting parked next to a cart in front of some boxes'. Replace the letter 't' with 'x' in the sentence.

Ex Output:
a bike sixxing parked nexx xo a carx in fronx of some boxes


Ex Input:
Sentence: 'a painting of a man sitting in front of a laptop'. Replace the letter 'f' with 'x' in the sentence.

Ex Output:

a painting ox a man sitting in xront ox a laptop