#pragma GCC target("sse,sse2,sse3,ssse3,sse4,abm,mmx,avx,avx2,popcnt,tune=native")
//#pragma GCC optimize("SEX_ON_THE_BEACH")
#pragma GCC optimize("fast-math")
#pragma GCC optimize("unroll-loops")
#pragma comment(linker, "/STACK:36777216")

#define _CRT_SECURE_NO_WARNINGS

#include <set>
#include <map>
#include <deque>
#include <cmath>
#include <queue>
#include <cassert>
#include <random>
#include <bitset>
#include <iomanip>
#include <numeric>
#include <time.h>//////////////
#include <ctime>
#include <string>
#include <cstdio>
#include <vector>
#include <cstdlib>
#include <iostream>
#include <algorithm>
#include <unordered_map>
#include <unordered_set>
//++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++
#define endl '\n'
#define mp make_pair
#define pbc push_back
#define pob pop_back()
#define empb emplace_back
#define queuel queue<long long>
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define matrix vector<vector<ll>>
#define pin(p) cin >> p.first >> p.second;
#define rev(v) reverse(v.begin(), v.end());
#define mx(v) max_element(v.begin(), v.end());
#define mn(v) min_element(v.begin(), v.end());
#define sout(s, c) for (auto i : s) cout << i << c;
#define pout(p) cout << p.first << " " << p.second;
#define er(v, l, r) erase(v.begin() + l, v.begin() + r);
#define vin(v) for (ll i = 0; i < v.size(); ++i) cin >> v[i];
#define vout(v, c) for (int i = 0; i < v.size(); ++i) cout << v[i] << c;
#define pushi(v, a) for (int i = 0; i < a.size(); ++i) v.push_back(a[i]);
#define sin(s, n) for (int i = 0; i < n; ++i){int a; cin >> a; s.insert(a); }
#define fastio() ios_base::sync_with_stdio(0); cout.tie(0); cin.tie(0); srand(time(NULL))
#define sp system("pause")
//++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++
using namespace std;//рџ¦Ђрџ¦Ђрџ¦Ђрџ¦Ђрџ¦Ђрџ¦Ђрџ¦Ђрџ¦Ђрџ¦Ђрџ¦Ђ
					//++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
//++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++--++
const int MAXN = 1e5;
const ll inf = 1e9;
const ld EPS = 1e-6;
const ld PI = acos(-1);
int mod = (int)998244353;
//const int MOD = 1000000007;
const int MOD9 = 1000000009;
const int a228 = 18;
const ll MOD = 1000000007;
const int maxelem = 12000000;
const int fsconst = 12000;
signed main()
{
	fastio();
	int n;
	cin >> n;
	if (n == 1)
	{
		cout << "1 : a";
		return 0;
	}
	if (n == 2)
	{
		cout << "1 : NO\n2 : aa";
		return 0;
	}
	cout << "1 : NO\n2 : NO\n";
	for (int i = 3; i <= n; ++i)
	{
		if (i <= 26)
		{
			string s = "";
			for (char c = 'a'; s.size() < n ; ++c)
			{
				s.pbc(c);
				if (c == (char)('a' +  i - 1)) c = 'a' - 1;
			}
			cout << i << " : " << s << endl;
		}
		else
		{
			string s = "";
			for (char c = 'a'; s.size() < n; ++c)
			{
				s.pbc(c);
				if (c == 'z') c = 'a' - 1;
			}
			if (i == n)
			{
				s = "abcdefghijklmnopqrstuvwxyzy";
				int left = i - 27;
				while (left--) s.pbc('y');
				cout << i << " : " << s << endl;
				continue;
			}
			int left = i - 26;
			char xxos = s.back();
			for (int j = s.size() - left - 1; j < s.size(); ++j)s[j] = xxos;

			cout <<i <<" : " << s << endl;
		}
	}
	sp;
}