use std::io::*;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let s: Vec<usize> = s
        .trim()
        .chars()
        .map(|c| (c as u8 - 'A' as u8) as usize)
        .collect();

    let mut ans = 1;
    let mut count: Vec<usize> = vec![0; 26];
    for i in 0..s.len() {
        ans *= i + 1;
        count[s[i]] += 1;
    }
    for i in 0..26 {
        for j in 0..count[i] {
            ans /= j + 1;
        }
    }
    println!("{}", ans - 1);
}