TASK DEFINITION: In this task, you need to replace a letter in the sentence with another given letter.
PROBLEM: Sentence: 'a giraffe walking in its natural habitat on the savannah'. Replace the letter 't' with 'u' in the sentence.

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

PROBLEM: Sentence: 'a hipster riding a skateboard up the side of a wall'. Replace the letter 's' with 'm' in the sentence.

SOLUTION: a hipmter riding a mkateboard up the mide of a wall

PROBLEM: Sentence: 'an empty living and dining room with a fire place'. Replace the letter 'e' with 'h' in the sentence.

SOLUTION:
an hmpty living and dining room with a firh plach