#include <bits/stdc++.h>
using namespace std;
int arr[100005];
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  ;
  int n, i;
  cin >> n;
  map<int, int> mp;
  for (i = 1; i <= n; i++) {
    cin >> arr[i];
    mp[arr[i]]++;
  }
  if (n == 1) {
    if (arr[1] % 2 == 1)
      cout << "sjfnb\n";
    else
      cout << "cslnb\n";
    return 0;
  }
  int cnt = 0, k = 0;
  for (__typeof((mp).end()) it = (mp).begin(); it != (mp).end(); it++) {
    if (it->second > 2) {
      cout << "cslnb\n";
      return 0;
    } else if (it->second == 2)
      k = it->first, cnt++;
  }
  if (cnt > 1 || mp[0] == 2) {
    cout << "cslnb\n";
  } else if (mp[k] == 2 && mp[k - 1] > 0) {
    cout << "cslnb\n";
  } else {
    long long sum1 = 0, sum2 = 0;
    for (i = 1; i <= n; i++) {
      sum1 += arr[i];
      sum2 += (i - 1);
    }
    long long d = sum1 - sum2;
    if (d % 2 == 1) {
      cout << "sjfnb\n";
    } else
      cout << "cslnb\n";
  }
  return 0;
}
