#![allow(non_snake_case)]

use std::io::{ self };

fn fac(n: i64) -> i64 {
    let mut res = 1;
    for i in 2..=n {
        res *= i;
    }
    res
}

fn main() {
    let mut s = String::new();
    io::stdin().read_line(&mut s).expect("i/o error");
    let v: Vec<_> = s.trim().bytes()
        .map(|b| b - b'A')
        .collect();
    let n = v.len() as i64;

    let mut cnt = [0; 26];
    for e in v {
        cnt[e as usize] += 1;
    }

    let mut ans = fac(n);
    for &e in cnt.iter() {
        if e >= 2 {
            ans /= fac(e);
        }
    }
    ans -= 1;

    println!("{}", ans);
}