fn main() {
    proconio::input! {
        s: String,
    }
    let mut c = s.chars().collect::<Vec<_>>();
    let max = c.iter().copied().enumerate().max_by_key(|x| x.1).unwrap();
    let first_index_except_max = c
        .iter()
        .copied()
        .enumerate()
        .find(|x| x.1 != max.1)
        .unwrap()
        .0;
    c.swap(first_index_except_max, max.0);
    println!("{}", c.iter().collect::<String>());
}