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	`1`	`+3120. Count the Number of Special Characters I`
	`2`	`+`
	`3`	`+You are given a string word. A letter is called special if it appears both in lowercase and uppercase in word.`
	`4`	`+`
	`5`	`+Return the number of special letters in word.`
	`6`	`+`
	`7`	`+`
	`8`	`+`
	`9`	`+Example 1:`
	`10`	`+`
	`11`	`+Input: word = "aaAbcBC"`
	`12`	`+`
	`13`	`+Output: 3`
	`14`	`+`
	`15`	`+Explanation:`
	`16`	`+`
	`17`	`+The special characters in word are 'a', 'b', and 'c'.`
	`18`	`+`
	`19`	`+Example 2:`
	`20`	`+`
	`21`	`+Input: word = "abc"`
	`22`	`+`
	`23`	`+Output: 0`
	`24`	`+`
	`25`	`+Explanation:`
	`26`	`+`
	`27`	`+No character in word appears in uppercase.`
	`28`	`+`
	`29`	`+Example 3:`
	`30`	`+`
	`31`	`+Input: word = "abBCab"`
	`32`	`+`
	`33`	`+Output: 1`
	`34`	`+`
	`35`	`+Explanation:`
	`36`	`+`
	`37`	`+The only special character in word is 'b'.`
	`38`	`+`
	`39`	`+`
	`40`	`+`
	`41`	`+Constraints:`
	`42`	`+`
	`43`	`+1 <= word.length <= 50`
	`44`	`+word consists of only lowercase and uppercase English letters.`

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