#include <iostream>
#include <vector>
#include <string>
#include <sstream>
using namespace std;

void keep_window_open();


int main()  {

    try {

        int i = 0;
        int j = 0;

        vector<int> comp(4);
        vector<int> user(4);
        vector<int> results(4);
        char tmp[4];

        comp[0] = 1;
        comp[1] = 2;
        comp[2] = 3;
        comp[3] = 4;

        cout << "1a2a3a\n";
        cin >> tmp;
        for (int i = 0; i < user.size(); i++) user[i] = static_cast<int> (tmp[i] - 0x30);


        cout << user.size() << " ";

        for (i = 0; i < user.size(); i++) cout << user[i] << " ";
        cout << endl;

        int cow = 0, bull = 0;

        for (i = 0; i < user.size(); i++)   {
            if (comp[i] == user[i]) {
                bull++;
                results[i] = 2;
            }
        }

        for (i = 0; i < user.size(); i++)   {
            for (j = 0; j < comp.size(); j++)   {
                if (j != i && results[i] == 0) {
                    cow++;
                    results[i] = 1;
                }
            }
        }

        cout << "\t" << bull << "\t" << cow;


        keep_window_open();
        return 0;

    } catch (exception& e)  {
        cerr << "Error: " << e.what() << "\n";
        keep_window_open();
        return 1;
    }

}



void keep_window_open()
{
    // clear buffer
    fflush(stdin);
    printf("\nPlease enter a character to exit\n");
    char ch;
    ch = getchar();
    return;
}