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#include <bits/stdc++.h> 

typedef long long int lli;

using namespace std;

#define MAX4 10010
#define MAX5 100010
#define MAX6 1000010

template <typename T >
void dbg(T last)
{
  cout << last << "\n";
}

template <typename T, typename ...args>
void dbg(T current, args ...next)
{
  cout << current << ' ';
  dbg(next...);
}

//-----------------------------------------------------------------------------------------------//

void printDefault(int i)
{
  for (int j=0;j<i;j++)
  {
    cout << "f";
  }
}

void printSpecial(int i, char c)
{
  for (int j=0;j<i;j++)
  {
    cout << c;
  }
}

void solve()
{
  int n;
  cin >> n;

  int sum0=0,sum1=0;

  for(int i=0;i<8*n;i++)
  {
    char c;
    cin >> c;

    if (c == '1')
    {
      sum1++;
    }
    else
    {
      sum0++;
    }
  }

  int d=0;

  if (sum0 < sum1)
  {
    d = sum0/4;
  }
  else
  {
    d = sum1/4;
  }

  for (int i=0;i<=d;i++)
  {
    if (sum0 < sum1)
    {
      int l = sum1-i*4;
      int p = sum0-i*4;
      int x = l/6;

      if (l-x*6 == 0 && p-x*2 == 0)
      {
        printDefault(i);
        printSpecial(x,'w');
        return;
      }
      else if(l-x*6 == 5 && p-x*2 == 3)
      {
        printDefault(i);
        printSpecial(x,'w');
        printSpecial(1,'s');
        return;
      }
      else if(l-x*6 == 3 && p-x*2 == 5)
      {
        printDefault(i);
        printSpecial(x,'w');
        printSpecial(1,'h');
        return;
      }
    }
    else
    {
      int l = sum1-i*4;
      int p = sum0-i*4;
      int x = p/5;

      if (p-x*5 == 0 && l-x*3 == 0)
      {
        printDefault(i);
        printSpecial(x,'h');
        return;
      }
      else if (p-x*5 == 2 && l-x*3 == 6)
      {
        printDefault(i);
        printSpecial(x,'h');
        printSpecial(1,'w');
        return;
      }
    }
  }

  cout << "NIE";
}

int main()
{
  std::ios::sync_with_stdio(false);

  solve();

  return 0;
}