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 living room with an orange couch and green decorations'. Replace the letter 'c' with 'm' in the sentence.

Ex Output:
a living room with an orange moumh and green demorations


Ex Input:
Sentence: 'a bathroom with red walls and a white toilet'. Replace the letter 'r' with 't' in the sentence.

Ex Output:

a bathtoom with ted walls and a white toilet