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

Ex Input:
Sentence: 'a large clock tower next to a building on a street'. Replace the letter 'c' with 'n' in the sentence.

Ex Output:
a large nlonk tower next to a building on a street


Ex Input:
Sentence: 'a building has a clock on the top of it'. Replace the letter 'l' with 'x' in the sentence.

Ex Output:
a buixding has a cxock on the top of it


Ex Input:
Sentence: 'a man that is standing up next to tents'. Replace the letter 'n' with 's' in the sentence.

Ex Output:

a mas that is stasdisg up sext to tests