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

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

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


Ex Input:
Sentence: 'a small plastic dish with food in it'. Replace the letter 'p' with 'g' in the sentence.

Ex Output:
a small glastic dish with food in it


Ex Input:
Sentence: 'two donkeys move through a misty walking path'. Replace the letter 'a' with 'x' in the sentence.

Ex Output:

two donkeys move through x misty wxlking pxth