slom

#include <bits/stdc++.h>

#define i64 long long
#define u64 unsigned long long
#define i32 int
#define u32 unsigned int

#define pii pair<int, int>
#define pll pair<long long, long long>

#define ld long double
#define defmod 1000000007

#define mati64(a,b) vector<vector<i64>>(a, vector<i64>(b, 0));
using namespace std;


int main(){
  cin.sync_with_stdio(0);
  cin.tie(0);

  int x; cin >> x;
  string s; cin >> s;
  int n = s.length();
 
  set<string> lel;
  int mm = 0;
  while(true){
    string lol(n, 'c');
    int i = 0, j = n-1;
    bool fak = 0;
    for(int k = 0; k < n; ++k){
      if(!fak){
	lol[i] = s[k];
	i++;
      }
      else{
	lol[j] = s[k];
	j--;
      }
      fak = !fak;
    }
    
    
    
    if(lel.count(lol))
      break;
    lel.insert(lol);
    mm++;
    s = lol;
  }
  //cout << "cycle " << mm << " jaa " << x%mm << endl;
  x = x%mm;
  while(x--){
    string lol(n, 'c');
    int i = 0, j = n-1;
    bool fak = 0;
    for(int k = 0; k < n; ++k){
      if(!fak){
	lol[i] = s[k];
	i++;
      }
      else{
	lol[j] = s[k];
	j--;
      }
      fak = !fak;
    }
    
    s = lol;
    //cout << s << endl;
  }
  cout << s << endl;
  return 0;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED