#include <bits/stdc++.h>
using namespace std;
int read(int &x) {
  int dat = 0;
  char chc = getchar();
  bool oko = 0;
  while (chc < '0' || chc > '9') {
    if (chc == '-') oko = 1;
    chc = getchar();
  }
  while (chc >= '0' && chc <= '9') {
    dat = dat * 10 + chc - '0';
    chc = getchar();
  }
  x = oko ? -dat : dat;
  return x;
}
int n, v[100001], f1, f2, mz;
int main() {
  read(n);
  for (int i = 1; i <= n; i++) read(v[i]);
  sort(v + 1, v + 1 + n);
  if (v[1] == v[2]) {
    mz++;
    if (!v[1]) {
      printf("cslnb\n");
      return 0;
    }
  }
  f1 = (v[1] % 2) ^ (v[2] % 2);
  for (int i = 3; i <= n; i++) {
    if (v[i] == v[i - 1]) {
      if (v[i] == v[i - 2]) {
        printf("cslnb\n");
        return 0;
      } else {
        mz++;
        if (mz >= 2) {
          printf("cslnb\n");
          return 0;
        }
        if (v[i - 2] + 1 == v[i]) {
          printf("cslnb\n");
          return 0;
        }
      }
    }
    bool t = v[i] % 2;
    f1 = f1 ^ t;
  }
  long long temp = n * (n - 1) / 2;
  f2 = temp % 2;
  if (f1 == f2)
    printf("cslnb\n");
  else
    printf("sjfnb\n");
  return 0;
}
