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

Ex Input:
Sentence: 'a crooked street sign on a damaged sidewalk'. Replace the letter 'm' with 'u' in the sentence.

Ex Output:
a crooked street sign on a dauaged sidewalk


Ex Input:
Sentence: 'a room with a bed, lamps, tables and pillows'. Replace the letter 's' with 'b' in the sentence.

Ex Output:
a room with a bed, lampb, tableb and pillowb


Ex Input:
Sentence: 'a red train traveling through a city on a train track'. Replace the letter 'v' with 'e' in the sentence.

Ex Output:

a red train traeeling through a city on a train track