fn main() {
    let mut x = String::new();
    std::io::stdin().read_line(&mut x).ok();
    let x = x.trim();

    let mut count = vec![0; 10];
    for c in x.chars() {
        let i = c as usize - '0' as usize;
        count[i] += 1;
    }

    if count.iter().filter(|&&n| n > 0).count() == 1 || count[0] == x.len() - 1 {
        println!("-1");
    } else {
        let chars: Vec<char> = (0..=9).map(|n| char::from_digit(n, 10).unwrap()).collect();

        let mut answer = vec![];
        for (i, &c) in count.iter().enumerate().rev() {
            answer.extend(vec![chars[i]; c]);
        }

        let last = answer[answer.len() - 1];
        let i = answer.iter().rposition(|&n| n != last).unwrap();
        let j = answer.iter().position(|&n| n == last).unwrap();

        answer.swap(i, j);

        let answer: String = answer.iter().collect();

        println!("{answer}");
    }
}