Coding: the problem received a string, like "a b1 c2", output is "cba". The input contains character, space, and number. We need to only use the letter part and reverse the string. differences between StringBuffer and StringBuilder. And some database questions, such as JOIN.

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Coding: the problem received a string, like "a b1 c2", output is "cba".  The input contains character, space, and number. We need to only use the letter part and reverse the string.   differences between StringBuffer and StringBuilder. And some database questions, such as JOIN.

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