import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
 
class Combine {
	public static void main(String[] args) throws IOException {
		BufferedReader bi = new BufferedReader(new InputStreamReader(System.in));
		String s1 = bi.readLine();
		String s2 = bi.readLine();
 
		String usedCharacters = "";
 
		for(int i = 0; i < s2.length(); i++) {
			String c = Character.toString(s2.charAt(i));
			if(!usedCharacters.contains(c) && !s1.contains(c)) 
				usedCharacters += c;
		}
 
		System.out.println(usedCharacters.length());
	}
}

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

YWJjZAphYWFiZGRjY2UgxIUx

abcd
aaabddcce ą1