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

Ex Input:
Sentence: 'a person holding a green cell phone in a classroom with many desks'. Replace the letter 'k' with 'w' in the sentence.

Ex Output:
a person holding a green cell phone in a classroom with many desws


Ex Input:
Sentence: 'a double decker bus stopped outside a station on a street'. Replace the letter 'c' with 'y' in the sentence.

Ex Output:
a double deyker bus stopped outside a station on a street


Ex Input:
Sentence: 'a girl brightly dressed, flying a kite high in the sky'. Replace the letter 'i' with 'q' in the sentence.

Ex Output:

a gqrl brqghtly dressed, flyqng a kqte hqgh qn the sky