#include <bits/stdc++.h>
using namespace std;
long long a[100002];
int main() {
  ios::sync_with_stdio(0), cin.tie(0);
  long long n, i, j;
  cin >> n;
  for (i = 0; i < n; i++) {
    cin >> a[i];
  }
  sort(a, a + n);
  if (n == 1) {
    if (a[0] & 1)
      cout << "sjfnb";
    else
      cout << "cslnb";
    return 0;
  }
  long long now = 0;
  for (i = 0; i < n - 1; i++)
    if (a[i] == a[i + 1]) {
      now = 1;
      if (a[i] == 0) {
        cout << "cslnb";
        return 0;
      }
      a[i]--;
      break;
    }
  long long les = a[0], nxt;
  for (i = 0; i < n; i++) {
    if (i && a[i - 1] == a[i]) {
      cout << "cslnb";
      return 0;
    }
  }
  for (i = 0; i < n; i++) {
    if (i < n - 1) nxt = les + a[i + 1] - a[i] - 1;
    a[i] -= les;
    now += les;
    now %= 2;
    les = nxt;
  }
  if (now == 0)
    cout << "cslnb";
  else
    cout << "sjfnb";
}
