#include <bits/stdc++.h>
#pragma comment(linker, "/STACK:256000000")
using namespace std;
const int maxN = (int)1e5 + 2;
int main() {
  int n;
  cin >> n;
  int a[maxN];
  for (int i = 0; i < (int)(n); ++i) cin >> a[i];
  sort(a, a + n);
  int cnt = 0, j = 1;
  for (int i = 0; i < (int)(n - 1); ++i) {
    if (a[i + 1] == a[i]) {
      cnt++;
      j = i;
    }
  }
  if (cnt > 1) {
    cout << "cslnb";
    return 0;
  }
  if (cnt == 1) {
    if (j == 0) {
      if (a[j] == 0) {
        cout << "cslnb";
        return 0;
      }
    } else {
      if (a[j] == a[j - 1] + 1) {
        cout << "cslnb";
        return 0;
      }
    }
  }
  int ans = 0;
  for (int i = 0; i < (int)(n); ++i) {
    ans += a[i] - i;
    ans %= 2;
  }
  if (ans)
    cout << "sjfnb";
  else
    cout << "cslnb";
  return 0;
}
