题解 | #字符个数统计#

import java.util.Scanner;
public class Main{
    public static void main(String []args){
        Scanner in = new Scanner(System.in);
        String str = in.next();
        if(1 <= str.length() && str.length() <= 500){
            int count = 1;
            for(int i = 1; i < str.length(); i++){
            for(int j = 0; j < i; j++){
                if(str.charAt(j) == str.charAt(i) && 0 <= str.charAt(i) && str.charAt(i) <= 127){
                    break;
                }
                if(j == i - 1){
                    count++;
                    }
                }
            }
            System.out.print(count);
        }
        in.close();
    }
}