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

Ex Input:
Sentence: 'a white stove top oven sitting in a kitchen'. Replace the letter 'k' with 'b' in the sentence.

Ex Output:
a white stove top oven sitting in a bitchen

Ex Input:
Sentence: 'a toilet and a microwave sitting out for the trash'. Replace the letter 'i' with 's' in the sentence.

Ex Output:
a toslet and a mscrowave ssttsng out for the trash

Ex Input:
Sentence: 'a large elephant tosses dirt with it's trunk'. Replace the letter 'a' with 'm' in the sentence.

Ex Output:
m lmrge elephmnt tosses dirt with it's trunk