use std::collections::HashSet;

fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let s = s.trim();
	if s.chars().filter(|&c| c != '0').count() < 2
		|| s.chars().collect::<HashSet<_>>().len() < 2
	{
		println!("-1");
		return;
	}
	let mut c: Vec<_> = s.chars().collect();
	c.sort();
	for i in 1.. {
		if c[i] != c[0] {
			c.swap(i, i - 1);
			break;
		}
	}
	println!("{}", c.iter().rev().collect::<String>())
}