#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int n;
  cin >> n;
  long long int a[n];
  for (int x = 0; x < n; x++) cin >> a[x];
  sort(a, a + n);
  long long int sum = 0;
  long long int g = 1;
  long long int d = 0;
  bool k = true;
  for (int x = 0; x < n; x++) {
    if (x != n - 1 && a[x] == a[x + 1])
      ++g;
    else
      g = 1;
    if (g == 2) ++d;
    if (g == 3 || d == 2) {
      k = false;
      break;
    }
    if (x > 0 && x < n && a[x] - a[x - 1] == 1 && a[x] == a[x + 1]) {
      k = false;
      break;
    }
    if (a[x] >= x)
      sum += (a[x] - x);
    else {
      k = false;
      break;
    }
  }
  if (!k)
    cout << "cslnb" << endl;
  else {
    if (sum % 2 == 0)
      cout << "cslnb" << endl;
    else
      cout << "sjfnb" << endl;
  }
}
