use std::collections::HashMap;

fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let s = s.trim();

    let mut counts = HashMap::new();
    for c in s.chars() {
        *counts.entry(c).or_insert(0) += 1;
    }

    let mut n: usize = (1..=s.len()).product();
    for &i in counts.values() {
        n /= (1..=i).product::<usize>();
    }
    n -= 1;

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