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

Ex Input:
Sentence: 'a person on a snow board flying through the air'. Replace the letter 'f' with 'n' in the sentence.

Ex Output:
a person on a snow board nlying through the air


Ex Input:
Sentence: 'a white plate topped with two sandwich halves and a pile of potatoes chips'. Replace the letter 'o' with 'x' in the sentence.

Ex Output:
a white plate txpped with twx sandwich halves and a pile xf pxtatxes chips


Ex Input:
Sentence: 'a group of surfboards laying out on a beach'. Replace the letter 's' with 'n' in the sentence.

Ex Output:

a group of nurfboardn laying out on a beach