Орфография дешифратор

#pragma once
#define _CRT_SECURE_NO_WARNINGS
#define _USE_MATH_DEFINES
#include <iostream>
#include <string>
#include <map>
#include <set>
#include <algorithm>
#include <vector>
#include <stdio.h>
#include <cmath>
#include <math.h>
#include <queue>
#include <stack>
#include <climits>
#include <deque>
#include <ctime>
#include <iomanip>
#include <bitset>
#include <unordered_map>
#include <unordered_set>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef unsigned int ui;

#define mh() make_heap()
#define poph() pop_heap()
#define pushh() push_heap()
#define sor(n) n.begin(), n.end()
#define rsor(n) n.rbegin(), n.rend()
#define mp make_pair
#define files freopen("input.txt", "rt", stdin); freopen("output.txt", "wt", stdout)
#define p(T) pair<T,T>
#define toch(x) cout.precision(x), cout.setf(ios::fixed)
#define znac(l) abs(l)/l
#define IOS ios::sync_with_stdio(false)
#define IOSB cin.tie(0), cout.tie(0);
const ll ok = ll(1e9 + 7);
ll i = 0;
string h;
void rec(ll pos, ll l, ll r, string s)
{
    if (l > r)
        return;
    h[pos-1] = s[i];
    i++;
    if (l >= r)
        return;
    rec((l + pos - 1) >> 1, l, pos - 1, s);
    rec((r + pos + 1) >> 1, pos+1, r, s);
}
int main()
{
    IOSB;
    IOS;
#ifdef TheCompiler
    files;
#endif
    string s;
    getline(cin, s);
    h.resize(s.size(), '0');
    rec((1 + s.size()) >> 1, 1, s.size(), s);
    cout << h;
    return 0;
}