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

Ex Input:
Sentence: 'a toilet that is being worked on with its seat removed'. Replace the letter 't' with 'p' in the sentence.

Ex Output:
a poilep phap is being worked on wiph ips seap removed

Ex Input:
Sentence: 'a group of giraffe standing on top of a dirt field'. Replace the letter 'a' with 'y' in the sentence.

Ex Output:
y group of giryffe stynding on top of y dirt field

Ex Input:
Sentence: 'a black cat laying down in a bathroom sink'. Replace the letter 'a' with 't' in the sentence.

Ex Output:
t bltck ctt ltying down in t btthroom sink