#include #include #include #include using namespace std; char pt0 = 'k'; char pt1 = 'l'; void step() { pt1++; if (pt1 > 'z') { pt0++; pt1 = pt0 + 1; } } string foo() { string ret; ret += pt0; ret += pt1; return ret; } string bar() { step(); return foo(); } string solve(int n) { if (n == 1) return bar(); if (n % 2 == 0) return foo() + solve(n / 2) + foo(); string t = bar(); return t + solve(n - 1) + t; } int main() { int n; cin >> n; cout << solve(n) << endl; }