#[allow(unused)]
use proconio::{input, marker::Chars};

fn main() {
    input! {
        mut n: usize,
    }
    let mut digits = Vec::new();
    let mut w = n;
    while w > 0 {
        digits.push(w % 10);
        w /= 10;
    }
    let m = digits.len();
    for i in 0..m {
        let x = digits[i];
        for j in i + 1..m {
            let y = digits[j];
            digits[i] = y;
            digits[j] = x;
            n = n.max(new_num(&digits));
            digits[i] = x;
            digits[j] = y;
        }
    }
    println!("{n}")
}
fn new_num(d: &Vec<usize>) -> usize {
    let mut ret = 0;
    let mut m = 1;
    for i in 0..d.len() {
        ret += m * d[i];
        m *= 10;
    }
    ret
}