#include<bits/stdc++.h> using namespace std; using ll = long long; #define FOR(i,a,b) for(ll i=(a);i<(b);++i) #define ALL(v) (v).begin(), (v).end() #define p(s) cout<<(s)<<endl #define p2(s, t) cout << (s) << " " << (t) << endl #define br() p("") #define pn(s) cout << (#s) << " " << (s) << endl #define p_yes() p("Yes") #define p_no() p("No") const ll mod = 1e9 + 7; const ll inf = 1e18; ll ll_pow(ll a, ll n){ ll v = 1; FOR(i, 0, n){ v *= a; } return v; } // 長さL string encode26(ll v){ ll L = 4; vector<ll> A(L); FOR(i, 0, L){ A[i] = v % 26; v /= 26; } stringstream ss; FOR(i, 0, L){ char c = 'a' + A[i]; ss << c; } string s = ss.str(); reverse(ALL(s)); return s; } int main(){ cin.tie(0); ios::sync_with_stdio(false); // input ll N; cin >> N; FOR(i, 0, N-1){ stringstream ss; ss << 'a'; ss << encode26(i); ss << 'a'; p(ss.str()); } p("an"); return 0; }