#include <iostream>
#include <vector>
#include <algorithm>
#include <cmath>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <unordered_map>
#include <chrono>
#include <random>
#include <bitset>
#include <iterator>
#include <functional>
#include <utility>
#include <cassert>
#pragma GCC optimize("O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma comment(linker, "STACK:36777216")
using namespace std;
using i64 = int64_t;
using i128 = __int128_t;
constexpr i64 MOD = 1e9 + 7;
mt19937 rnd(chrono::steady_clock::now().time_since_epoch().count());
using vi = vector<i64>;
using vvi = vector<vi>;
using vvvi = vector<vvi>;
using ii = pair<i64, i64>;

int main() {
    int n;
    cin >> n;
    deque<char> ans = {'a'};
    string b = "";
    while (n) {
        b += '0' + (n & 1);
        n >>= 1;
    }
    reverse(b.begin(), b.end());
    for (int i = 0; i < b.size(); i++) {
        if (i != 0 && b[i] == '1') {
            ans.push_front(ans.front() + 1);
            ans.push_back(ans.back() + 1);
        }
        if (i != b.size() - 1) {
            ans.push_front(ans.front());
            ans.push_back(ans.back());
        }
    }
    for (int i = 0; i < ans.size() - 1; i++) {
        cout << ans[i];
    }
    cout << ans.back() << endl;
}