题解 | #字符个数统计#

import java.util.Scanner;
import java.util.*;
import java.*;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        String baseStr = in.nextLine();
        String[] split = baseStr.split("");
        Integer ascii = 0;
        char[] baseChar;
        HashSet<String> HashSet = new HashSet<String>();
        for (int i = 0; i < split.length; i++) {
            if(split[i] == null && split[i] ==""){
                continue;
            }
            
            baseChar = split[i].toCharArray();
            ascii = Integer.valueOf(baseChar[0]);
            if (ascii <= 127) {
                HashSet.add(split[i]);
            }
        }
        System.out.print(HashSet.size());
    }
}