You are given a string word. A letter is called special if it appears both in lowercase and uppercase in word.
Return the number of special letters in word.
\n
Example 1:
\n\nInput: word = "aaAbcBC"
\n\nOutput: 3
\n\nExplanation:
\n\nThe special characters in word are 'a', 'b', and 'c'.
Example 2:
\n\nInput: word = "abc"
\n\nOutput: 0
\n\nExplanation:
\n\nNo character in word appears in uppercase.
Example 3:
\n\nInput: word = "abBCab"
\n\nOutput: 1
\n\nExplanation:
\n\nThe only special character in word is 'b'.
\n
Constraints:
\n\n1 <= word.length <= 50word consists of only lowercase and uppercase English letters.给你一个字符串 word。如果 word 中同时存在某个字母的小写形式和大写形式，则称这个字母为 特殊字母 。
返回 word 中 特殊字母 的数量。
\n\n
示例 1:
\n\n输入：word = \"aaAbcBC\"
\n\n输出：3
\n\n解释：
\n\nword 中的特殊字母是 'a'、'b' 和 'c'。
示例 2:
\n\n输入：word = \"abc\"
\n\n输出：0
\n\n解释：
\n\nword 中不存在大小写形式同时出现的字母。
示例 3:
\n\n输入：word = \"abBCab\"
\n\n输出：1
\n\n解释：
\n\nword 中唯一的特殊字母是 'b'。
\n\n
提示：
\n\n1 <= word.length <= 50word 仅由小写和大写英文字母组成。word."
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"solution": null,
"status": null,
"sampleTestCase": "\"aaAbcBC\"",
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