import java.util.*;

public class Main {
	public static void main (String[] args) {
    	Scanner sc = new Scanner(System.in);
    	char[] arr = sc.next().toCharArray();
    	Arrays.sort(arr);
    	if (arr[0] == arr[arr.length - 1]) {
    	    System.out.println(-1);
    	    return;
    	}
    	for (int i = 1; i < arr.length; i++) {
    	    if (arr[i] != arr[0]) {
    	        char x = arr[i];
    	        arr[i] = arr[i - 1];
    	        arr[i - 1] = x;
    	        break;
    	    }
    	}
    	if (arr[arr.length - 1] == '0') {
    	    System.out.println(-1);
    	    return;
    	}
    	StringBuilder sb = new StringBuilder(new String(arr));
    	sb.reverse();
    	System.out.println(sb);
    }
}