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