fn main() {
    proconio::input! {
        s: String,
    }
    let mut c = s.chars().collect::<Vec<_>>();
    for i in 0..c.len() {
        let max_index = c[i..].iter().enumerate().max_by_key(|&(_, c)| c).unwrap().0;
        if max_index != 0 {
            c.swap(i, i + max_index);
            break;
        }
    }
    println!("{}", c.iter().collect::<String>());
}