// PATn.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include<iostream>
#include<set>


using namespace std;


unsigned get_friend(unsigned n)
{
    unsigned ret = 0;
    while (n>0)
    {
        ret = ret + n % 10;
        n = n / 10;
    }
    return ret;
}

int main()
{
    unsigned n;
    cin >> n;

    set<unsigned> data;

    for (unsigned i = 0; i < n; ++i)
    {
        unsigned tmp;
        cin >> tmp;
        data.insert(get_friend(tmp));
    }

    cout << data.size() << endl;
    auto beg = data.cbegin();           //set的值为key，可以通过迭代器访问！find是查找是否有某元素！
    for (size_t i = 0; i < data.size(); ++i)
    {
        cout << *beg;
        ++beg;
        
        if (i != (data.size() - 1))
            cout << " ";
    }

    system("pause");
    return 0;
}