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

Ex Input:
Sentence: 'a boy on the beach playing with a frisbee'. Replace the letter 'h' with 'e' in the sentence.

Ex Output:
a boy on tee beace playing wite a frisbee


Ex Input:
Sentence: 'a man on a surfboard riding on the waters waves'. Replace the letter 's' with 'k' in the sentence.

Ex Output:
a man on a kurfboard riding on the waterk wavek


Ex Input:
Sentence: 'there are horses standing outside a old building'. Replace the letter 't' with 'c' in the sentence.

Ex Output:

chere are horses scanding oucside a old building