#include<stdio.h>
#include<string.h>
int main()
{
	char x[100005];
	scanf("%s", x);
	int i, j, n = strlen(x);
	int c[10];
	for (i = 0; i < 10; i++)
		c[i] = 0;
	for (i = 0; i < n; i++)
		c[x[i] - '0']++;
	int count = 0;
	for (i = 0; i < 10; i++)
		if (c[i] > 0)
			count++;
	if (count == 1)
	{
		printf("-1\n");
		return 0;
	}
	if (count == 2 && c[0] > 0)
	{
		i = 1;
		while (c[i] == 0)
			i++;
		if (c[i] == 1)
		{
			printf("-1\n");
			return 0;
		}
	}
	j = 9;
	for (i = 0; i < n; i++)
	{
		while (c[j] == 0)
			j--;
		x[i] = j + '0';
		c[j]--;
	}
	i = n - 1;
	while (x[i - 1] == x[i])
		i--;
	x[i] ^= x[i - 1];
	x[i - 1] ^= x[i];
	x[i] ^= x[i - 1];
	printf("%s\n", x);
	return 0;
}