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

Input: Consider Input: Sentence: 'young boy leaping into air with tennis racket with dog below him'. Replace the letter 't' with 'r' in the sentence.

Output: young boy leaping inro air wirh rennis racker wirh dog below him


Input: Consider Input: Sentence: 'a photo of a river with a train bridge across it'. Replace the letter 'r' with 'f' in the sentence.

Output: a photo of a fivef with a tfain bfidge acfoss it


Input: Consider Input: Sentence: 'cat with purple collar being vocal while sitting on seat'. Replace the letter 'e' with 'f' in the sentence.


Output: cat with purplf collar bfing vocal whilf sitting on sfat