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

Ex Input:
Sentence: 'group playing frisbee with runners in grassy field'. Replace the letter 'l' with 'q' in the sentence.

Ex Output:
group pqaying frisbee with runners in grassy fieqd

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: 'there is an airplane going down a runway at the airport'. Replace the letter 'a' with 'd' in the sentence.

Ex Output:
there is dn dirpldne going down d runwdy dt the dirport