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

Ex Input:
Sentence: 'a person and a dog are on a bench'. Replace the letter 'e' with 'r' in the sentence.

Ex Output:
a prrson and a dog arr on a brnch


Ex Input:
Sentence: 'a person is waiting for a pizza to come out of an oven fired grill'. Replace the letter 's' with 'k' in the sentence.

Ex Output:
a perkon ik waiting for a pizza to come out of an oven fired grill


Ex Input:
Sentence: 'a group of four playing frisbee in a yard'. Replace the letter 'e' with 'a' in the sentence.

Ex Output:

a group of four playing frisbaa in a yard