using System;

public class Hello
{
    static void Main()
    {
        var s = Console.ReadLine().Trim();
        getAns(s);
    }
    static void minus1(int n, int[] a)
    {
        for (int i = n - 1; i >= 0; i--)
        {
            if (a[i] == 0) a[i] = 9;
            else { a[i]--; break; }
        }
    }
    static void getAns(string s)
    {
        var n = s.Length;
        var a = new int[n];
        var f3 = false;
        var sum = 0;
        for (int i = 0; i < n; i++)
        {
            if (f3) a[i] = 9;
            else
            {
                if (s[i] == '3') { f3 = true; a[i] = 2; }
                else a[i] = s[i] - '0';
            }
            sum += a[i];
        }
        if (sum % 3 != 0) Console.WriteLine(string.Join("", a));
        else
        {
            if (a[n - 1] != 0) a[n - 1]--;
            else minus1(n, a);
            Console.WriteLine(string.Join("", a));
        }
    }
}