1、先对字符去重,用set集合即可
2、输出数量即可
package com.newcoder.huawei;
import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;
/**
* 字符个数统计
*/
public class HJ10 {
public static void main(String[] args){
Scanner in = new Scanner(System.in);
Set charSet = new TreeSet();
while (in.hasNext()) {
String inputLine = in.nextLine();
inputLine = inputLine.replace(" ", "");
char[] charArray = inputLine.toCharArray();
for (int i = 0; i < charArray.length; i++) {
charSet.add(charArray[i]);
}
}
System.out.println(charSet.size());
}
}