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: 'subway train approaching the platform of a subway station'. Replace the letter 'y' with 'c' in the sentence.

Output: subwac train approaching the platform of a subwac station


Input: Consider Input: Sentence: 'a clock tower made of bricks outside when it is not so bright'. Replace the letter 'o' with 't' in the sentence.


Output: a cltck ttwer made tf bricks tutside when it is ntt st bright