Codeforces Anton and Letters

题目链接：http://codeforces.com/problemset/problem/443/A

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class AntonAndLetters {

public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
char[] ch = scanner.nextLine().toCharArray();
Map<Character, Integer> map = new HashMap<>();
for(Character character : ch) {
if (character != '{' && character != '}' && character != ',' && character != ' ') {
map.put(character, 1);
}
}
System.out.println(map.size());
}
}