Магические числа Знайки

#define _USE_MATH_DEFINES
#include <iostream>
#include <string>
#include <map>
#include <set>
#include <algorithm>
#include <vector>
#include <stdio.h>
#include <cmath>
#include <math.h>
#include <queue>

using namespace std;

int sum(int n)
{
    string prom = to_string(n);
    int Sum = 0;
    for (int i = 0; i <= prom.size() - 1; i++)
    {
        Sum += prom[i] - '0';
    }
    return Sum;
}
int main()
{
    vector<int>all;
    int n;
    cin >> n;

    int i = n;
    int u = n;
    while(u>0)
    {
        if (u - sum(i) < 0)
            i--;
        else
        {
            all.push_back(i);
            u -= sum(i);
            i--;
        }
    }

    if (u > 0)
        cout << -1;
    else
    {
        cout << all.size() << endl;

        for (auto i = all.begin(); i != all.end(); i++)
        {
            cout << *i << " ";
        }
    }
    system("pause");
    return 0;
}