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 row of lawn chairs with umbrellas over them'. Replace the letter 'e' with 'x' in the sentence.

Ex Output:
a row of lawn chairs with umbrxllas ovxr thxm


Ex Input:
Sentence: 'a man about to drink a bright green liquid from a glass'. Replace the letter 'm' with 'w' in the sentence.

Ex Output:

a wan about to drink a bright green liquid frow a glass