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

Ex Input:
Sentence: 'a gray and white cat sleeping on top of a laptop computer'. Replace the letter 'l' with 'g' in the sentence.

Ex Output:
a gray and white cat sgeeping on top of a gaptop computer


Ex Input:
Sentence: 'a woman standing in front of a bear in an enclosure'. Replace the letter 'e' with 'r' in the sentence.

Ex Output:
a woman standing in front of a brar in an rnclosurr


Ex Input:
Sentence: 'a pizza sitting on top of a metal pizza pan'. Replace the letter 'p' with 't' in the sentence.

Ex Output:

a tizza sitting on tot of a metal tizza tan