#include<iostream>
using namespace std;

int main()
{
    unsigned int x, k = 0, c;
    int y, z;
    cin >> x;
    z = 0; y = 0;
    while (x != 0)
    {
        c = x % 10;
        if (c == 9)
        {
            y = -1;
            break;
        }
        z = z * 10 + c + 1;
        k++;
        x = x / 10;
    }
    if (y != -1)
        while (z != 0)
        {
            y = y * 10 + z % 10;
            z = z / 10;
        }

    cout << y;

    return 0;
}