use std::io::Read;

fn main() {
    let mut s: String = String::new();
    std::io::stdin().read_to_string(&mut s).ok();
    let mut itr = s.trim().split_whitespace();
    let n: Vec<char> = itr.next().unwrap().chars().collect();

    let mut kouho: Vec<String> = Vec::new();
    let s = n.clone().into_iter().collect();
    kouho.push(s);
    for i in 0..n.len() {
        for j in i + 1..n.len() {
            let mut m = n.clone();
            m.swap(i, j);
            kouho.push(m.into_iter().collect());
        }
    }
    kouho.sort_by(|a, b| b.cmp(&a));
    println!("{}", kouho[0]);
}