fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let mut c: Vec<_> = s.trim().chars().collect();
	c.sort();
	if let Some(p) = c.iter().position(|&x| x != c[0]) {
		if c[0] != '0' || p != c.len() - 1 {
			c.swap(p - 1, p);
			println!("{}", c.iter().rev().collect::<String>());
			return;
		}
	}
	println!("-1");
}