use std::collections::HashMap;

fn comb(a: usize, b: usize) -> usize {
    let mut ret = 1;
    (1..=a).rev().take(b).for_each(|i| ret *= i);
    (1..=b).for_each(|i| ret /= i);
    ret
}

fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let mut length = s.trim().len();
    let mut dict: HashMap<char, usize> = HashMap::new();
    s.trim().chars().for_each(|c| {
        let count = dict.entry(c).or_insert(0);
        *count += 1;
    });
    let mut result: usize = 1;
    for v in dict.values() {
        result *= comb(length, *v);
        length -= v;
    }
    println!("{}", result - 1);
}