import java.io.*;
import java.util.*;
import java.util.stream.*;

public class Main {
    static HashSet<String> ans = new HashSet<>();
    public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner();
        char[] input = sc.next().toCharArray();
        check(0, input, new char[input.length], new boolean[input.length]);
        System.out.println(ans.size() - 1);
    }
    
    static void check(int idx, char[] input, char[] value, boolean[] used) {
        if (idx == input.length) {
            ans.add(new String(value));
            return;
        }
        for (int i = 0; i < input.length; i++) {
            if (used[i]) {
                continue;
            }
            used[i] = true;
            value[idx] = input[i];
            check(idx + 1, input, value, used);
            used[i] = false;
        }
    }
}
class Utilities {
    static String arrayToLineString(Object[] arr) {
        return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n"));
    }
    
    static String arrayToLineString(int[] arr) {
        return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new));
    }
}
class Scanner {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    StringTokenizer st = new StringTokenizer("");
    StringBuilder sb = new StringBuilder();
    
    public Scanner() throws Exception {
        
    }
    
    public int nextInt() throws Exception {
        return Integer.parseInt(next());
    }
    
    public long nextLong() throws Exception {
        return Long.parseLong(next());
    }
    
    public double nextDouble() throws Exception {
        return Double.parseDouble(next());
    }
    
    public int[] nextIntArray() throws Exception {
        return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray();
    }
    
    public String next() throws Exception {
        while (!st.hasMoreTokens()) {
            st = new StringTokenizer(br.readLine());
        }
        return st.nextToken();
    }
    
}