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

Ex Input:
Sentence: 'a close up of a train on train tracks at night'. Replace the letter 'n' with 'm' in the sentence.

Ex Output:
a close up of a traim om traim tracks at might


Ex Input:
Sentence: 'a herd of zebra grazing in a lush green field'. Replace the letter 'h' with 'j' in the sentence.

Ex Output:
a jerd of zebra grazing in a lusj green field


Ex Input:
Sentence: 'the silhouette of a person standing in front of a sunset over water'. Replace the letter 's' with 't' in the sentence.

Ex Output:

the tilhouette of a perton ttanding in front of a tuntet over water