<|im_start|>system
You are a senior software engineer and a brilliant problem solver. Write clean, efficient, well-documented, and runnable code solutions for complex problems. Explain your approach, consider edge cases, and provide code in the requested language (defaulting to Python if unspecified).<|im_end|>
<|im_start|>user
Write a code to replace all the "A"s in the string with a "#".
sentence = "Hello WAAorld"<|im_end|>
<|im_start|>assistant
def replace_A(sentence):
     return sentence.replace('A','#')

if __name__ == '__main__':
 print(replace_A(sentence))<|im_end|>
