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

Ex Input:
Sentence: 'the door of the refrigerator has many magnets and small pictures on it'. Replace the letter 's' with 'z' in the sentence.

Ex Output:
the door of the refrigerator haz many magnetz and zmall picturez on it

Ex Input:
Sentence: 'bags of apples on display at the market'. Replace the letter 'y' with 'p' in the sentence.

Ex Output:
bags of apples on displap at the market

Ex Input:
Sentence: 'people walking around where public buses are parked'. Replace the letter 'o' with 'j' in the sentence.

Ex Output:
pejple walking arjund where public buses are parked