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