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

Ex Input:
Sentence: 'a red train sitting at an empty station'. Replace the letter 'i' with 'h' in the sentence.

Ex Output:
a red trahn shtthng at an empty stathon


Ex Input:
Sentence: 'a man that is on the back of an elephant'. Replace the letter 'c' with 'd' in the sentence.

Ex Output:
a man that is on the badk of an elephant


Ex Input:
Sentence: 'a white toilet sitting inside of a bathroom stall'. Replace the letter 'r' with 'o' in the sentence.

Ex Output:

a white toilet sitting inside of a bathooom stall