use std::collections::HashSet;

fn dfs(s: &mut Vec<char>, result: &mut HashSet<String>, sidx: usize, eidx: usize, orgs: &str) {
    if sidx == eidx {
        result.insert(s.iter().map(|c| c.to_string()).collect::<Vec<String>>().join(""));
        return;
    }
    s.push(orgs.chars().nth(sidx).unwrap());
    dfs(s, result, sidx+1, eidx, orgs);
    s.pop();
    s.push(orgs.chars().nth(eidx).unwrap());
    dfs(s, result, sidx, eidx-1, orgs);
    s.pop();
}

fn main() {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    let s: &str = s.trim();
    let mut result: HashSet<String> = HashSet::new();
    let mut sc: Vec<char> = vec![];
    dfs(&mut sc, &mut result, 0, s.len()-1, s);
    println!("{}", result.len());
}