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

Input: Consider Input: Sentence: 'a man is somewhat hard to be seen in the wave, on his board'. Replace the letter 's' with 'b' in the sentence.

Output: a man ib bomewhat hard to be been in the wave, on hib board


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

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


Input: Consider Input: Sentence: 'a person riding a surf board on a wave'. Replace the letter 'n' with 't' in the sentence.


Output: a persot riditg a surf board ot a wave