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();
	for i in 0..c.len() {
		if c[i] != c[0] && (i < c.len() - 1 || c[0] != '0') {
			c.swap(i, i - 1);
			println!("{}", c.iter().rev().collect::<String>());
			return;
		}
	}
	println!("-1");
}