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

Input: Consider Input: Sentence: 'a giraffe walking in its natural habitat on the savannah'. Replace the letter 't' with 'u' in the sentence.

Output: a giraffe walking in ius nauural habiuau on uhe savannah


Input: Consider Input: Sentence: 'a couple of people that are petting a horse'. Replace the letter 'e' with 'p' in the sentence.

Output: a couplp of ppoplp that arp pptting a horsp


Input: Consider Input: Sentence: 'a couple of people are standing in the middle of a room'. Replace the letter 'm' with 'x' in the sentence.


Output: a couple of people are standing in the xiddle of a roox