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#include <iostream>
#include <algorithm>
#include <cstdio>
#include <math.h>
#include <iomanip>
#include <set>
#include <list>
#include <queue>
#include <map>
#include <vector>
#include <stack>
#include <string>
constexpr int N = 1e6 + 7;

int main()
{
    std::ios_base::sync_with_stdio(0);
    std::cin.tie(0);

    int n;
    std::cin >> n;
    std::string napis = "";

    if (n == 1)
    {
        napis += "FBD";
        std::cout << napis;
        return 0;
    }
    else
    {
        std::string y = std::to_string(n);
        napis += y;
        napis += "F";
        napis += y;
        napis += "B";
        napis += "D";
        for (int i = n - 1; i > 1; --i)
        {


            std::string x = std::to_string(i);
            napis += x;
            napis += "E";
            napis += x;
            napis += "[AC]";
            napis += "D";
        }
        napis += "EACD";
        std::cout << napis;
        return 0;
    }
}