#![allow(unused_imports)]
#![allow(non_snake_case)]
use std::cmp::*;
use std::collections::*;
use std::io::Write;

#[allow(unused_macros)]
macro_rules! debug {
    ($($e:expr),*) => {
        #[cfg(debug_assertions)]
        $({
            let (e, mut err) = (stringify!($e), std::io::stderr());
            writeln!(err, "{} = {:?}", e, $e).unwrap()
        })*
    };
}

fn main() {
    let mut s = read::<String>().chars().collect::<Vec<_>>();
    s.sort();

    let mut swapped = false;
    for i in 1..s.len() {
        if i == s.len() - 1 && s[i - 1] == '0' {
            break;
        }
        if s[i - 1] != s[i] {
            let temp = s[i];
            s[i] = s[i - 1];
            s[i - 1] = temp;
            swapped = true;
            break;
        }
    }
    s.reverse();
    if !swapped {
        println!("-1");
        return;
    }
    for ch in s {
        print!("{}", ch);
    }
    println!("");
}

fn read<T: std::str::FromStr>() -> T {
    let mut s = String::new();
    std::io::stdin().read_line(&mut s).ok();
    s.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>()
        .split_whitespace()
        .map(|e| e.parse().ok().unwrap())
        .collect()
}