#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  string ans = "";
  vector<int> a;
  cin >> n;
  for (int i = 0; i < n; ++i) {
    int elm;
    cin >> elm;
    a.push_back(elm);
  }
  sort(a.begin(), a.end());
  int cnt = 1, rmvtls = a[0], lelm = a[0], lcnt;
  bool multi = false;
  if (a[0] == 0 && a[1] == 0) {
    cout << "cslnb";
    return 0;
  }
  for (int i = 1; i < n; ++i) {
    if (a[i] == a[i - 1]) {
      if (multi) {
        cout << "cslnb";
        return 0;
      }
      cnt++;
      if (cnt > 2) {
        cout << "cslnb";
        return 0;
      }
      if (cnt > 1) {
        multi = true;
        if (lelm == a[i] - 1 && lcnt > 0) {
          cout << "cslnb";
          return 0;
        }
      }
    } else {
      lelm = a[i - 1];
      lcnt = cnt;
      cnt = 1;
    }
    rmvtls += a[i] - i;
  }
  if (rmvtls % 2 == 0) {
    cout << "cslnb";
  } else {
    cout << "sjfnb";
  }
  return 0;
}
