instruction:
In this task, you need to replace a letter in the sentence with another given letter.
question:
Sentence: 'a cat is watching a computer with a video of a cat'. Replace the letter 't' with 'a' in the sentence.
answer:
a caa is waaching a compuaer wiah a video of a caa


question:
Sentence: 'a man who is surfing in a wave in the ocean'. Replace the letter 'a' with 'u' in the sentence.
answer:
u mun who is surfing in u wuve in the oceun


question:
Sentence: 'a woman taking a bite out of a sandwich and a man'. Replace the letter 'n' with 'z' in the sentence.
answer:

a womaz takizg a bite out of a sazdwich azd a maz