abc264_a.cpp

/****************************************************************/
/*                Author : Muzakkir Hossain Minhaz              */
/*           Github : github.com/MuzakkirHossainMinhaz          */
/*      Linkedin : linkedin.com/in/muzakkir-hossain-minhaz      */
/****************************************************************/

#include <bits/stdc++.h>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);

    string str = "atcoder";
    int l, r;
    cin >> l >> r;

    for(int i=l-1; i<r; i++)
        cout << str[i];

    cout << endl;

    return 0;
}