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

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 toddler on skis being held up by a grownup'. Replace the letter 'o' with 'k' in the sentence.

Ex Output:
a tkddler kn skis being held up by a grkwnup


Ex Input:
Sentence: 'a man standing on a stage holding up a skateboard'. Replace the letter 'h' with 'a' in the sentence.

Ex Output:

a man standing on a stage aolding up a skateboard