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