[백준] 7600번 문자가 몇갤까 문제! (bronze 2

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {
	public static void main(String[] args) throws IOException {
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(System.out));
		int[] word;
		int count=0;
		while(true){
			String a=br.readLine();
			if(a.equals("#")) {
				break;
			}
			a=a.toUpperCase();
			word=new int[26];
			for(int i=0; i<a.length(); i++) {
				if(a.charAt(i)-'A'>=0 && a.charAt(i)-'A'<=26) {
					word[a.charAt(i)-'A']++;
				}
			}
			count=0;
			for(int i=0; i<word.length; i++) {
				if(word[i]!=0) {
					count++;
				}
			}
			bw.write(count+"\n");
		
		}
		bw.flush();
	}
}