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

Ex Input:
Sentence: 'one wall in the room is flanked by a lovely piece of furniture which displays several object d'art'. Replace the letter 'n' with 'z' in the sentence.

Ex Output:
oze wall iz the room is flazked by a lovely piece of furziture which displays several object d'art

Ex Input:
Sentence: 'a red train sitting at an empty station'. Replace the letter 'i' with 'h' in the sentence.

Ex Output:
a red trahn shtthng at an empty stathon

Ex Input:
Sentence: 'a representation of a combined living room and kitchen'. Replace the letter 'a' with 'x' in the sentence.

Ex Output:
x representxtion of x combined living room xnd kitchen