#include <bits/stdc++.h>
using namespace std;
long long mod = 1000000007;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  ;
  {
    long long a, b, c, d, i, j, k, l, m, n, sum = 0, temp = 0, f = 0, cnt = 0;
    cin >> n;
    long long arr[n];
    for (i = 0; i < n; i++) cin >> arr[i];
    sort(arr, arr + n);
    map<long long, long long> mp;
    int ok = 1;
    for (i = 0; i < n; i++) {
      mp[arr[i]]++;
      if (mp[arr[i]] >= 3) ok = 0;
      if (mp[arr[i]] == 2) cnt++;
      if (cnt > 1) ok = 0;
      if (mp[arr[i]] == 2) {
        a = arr[i];
      }
    }
    if (mp[a - 1] > 0 || a == 0) ok = 0;
    if (!ok) {
      cout << "cslnb"
           << "\n";
      return 0;
    }
    for (i = 0; i < n; i++) sum += arr[i] - i;
    if (sum & 1)
      cout << "sjfnb"
           << "\n";
    else
      cout << "cslnb"
           << "\n";
  }
}
