#include<iostream>
#include<string>
#include<math.h>

using namespace std;

string int2a_b_string(int num){
    long ans = 0;
    for(int i=0;num>0;i++){
        ans = ans+(num%2)*pow(10,i);
        num=num/2;
    }
    string bin = to_string(ans);
    string outstr = "";
    for(int j=bin.size()-1;j>=0;j--){
        if(bin[j]=='0') outstr = "a" + outstr;
        else outstr = "b" + outstr;
    }
    return outstr;
}

int main(){
    int n;
    cin >> n;
    for(int k=0;k<n;k++){
        cout << "c" << int2a_b_string(k) << "c";
        if(k==n-1) cout << "n\n";
        else cout << "\n";
    }
    return 0;
}