#include <bits/stdc++.h>
using namespace std;
int a[100005];
void solve() {
  int n;
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  sort(a, a + n);
  int same = 0;
  for (int i = 1; i < n; i++) {
    if (a[i] == a[i - 1]) {
      same++;
      if (a[i] == 0 || i > 1 && a[i - 2] + 1 == a[i]) {
        same++;
      }
    }
  }
  if (same > 1) {
    cout << "cslnb" << endl;
    return;
  }
  long long sum = 0;
  for (int i = 0; i < n; i++) {
    sum += a[i] - i;
  }
  if (sum <= 0 || sum % 2 == 0) {
    cout << "cslnb" << endl;
  } else {
    cout << "sjfnb" << endl;
  }
}
int main() {
  ios::sync_with_stdio(false);
  solve();
  return 0;
}
