#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  int n, temp = 0, sum = 0;
  cin >> n;
  vector<int> a(n + 1);
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
    sum += a[i];
  }
  sort(a.begin(), a.end());
  for (int i = 1; i < n; i++)
    if (a[i] == a[i + 1])
      if (temp) {
        cout << "cslnb";
        return 0;
      } else
        temp = i;
  if (temp && a[temp] == 0 || (a[temp - 1] == a[temp] - 1 && temp != 1)) {
    cout << "cslnb";
    return 0;
  }
  sum -= (n * (n - 1) / 2);
  if (sum % 2)
    cout << "sjfnb";
  else
    cout << "cslnb";
  return 0;
}
