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

Ex Input:
Sentence: 'the cargo train is headed to the next destination'. Replace the letter 'h' with 'x' in the sentence.

Ex Output:
txe cargo train is xeaded to txe next destination


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 pizza and chicken wings on a table'. Replace the letter 'z' with 'e' in the sentence.

Ex Output:

a pieea and chicken wings on a table