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

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

A: a giraffe walking in ius nauural habiuau on uhe savannah
****
Q: Sentence: 'a mobile phone and a set of keys on a key chain'. Replace the letter 's' with 'j' in the sentence.

A: a mobile phone and a jet of keyj on a key chain
****
Q: Sentence: 'someone is standing outside with a unique device'. Replace the letter 'h' with 'l' in the sentence.

A:
someone is standing outside witl a unique device
****