Check if All A's Appears Before All B's: coding question

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Given a string of only 'a' and 'b', determine whether all 'a' characters occur before any 'b' characters — equivalently, ensure there is no 'a' that appears after a 'b'.

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Leetcode 2124. Check if All A's Appears Before All B's
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Check if All A's Appears Before All B's

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Check if All A's Appears Before All B's

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