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

Ex Input:
Sentence: 'a giraffe standing alone with a low fence behind it'. Replace the letter 't' with 'o' in the sentence.

Ex Output:
a giraffe soanding alone wioh a low fence behind io

Ex 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.

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

Ex Input:
Sentence: 'a model airplae sitting next to a computer monitor'. Replace the letter 'u' with 'x' in the sentence.

Ex Output:
a model airplae sitting next to a compxter monitor