#include <bits/stdc++.h>
using namespace std;
template <typename T>
void read(T &x) {
  x = 0;
  char ch = getchar();
  int fh = 1;
  while (ch < '0' || ch > '9') {
    if (ch == '-') fh = -1;
    ch = getchar();
  }
  while (ch >= '0' && ch <= '9') x = x * 10 + ch - '0', ch = getchar();
  x *= fh;
}
int n, a[100010], c1;
int main() {
  read(n);
  for (int i = 1; i <= n; i++) read(a[i]);
  sort(a + 1, a + n + 1);
  for (int i = 1; i < n; i++) {
    if (a[i] == a[i + 1]) {
      if ((i != 1 && a[i - 1] + 1 == a[i]) || a[i] == 0) c1++;
      c1++;
    }
  }
  if (c1 >= 2) {
    puts("cslnb");
  } else {
    long long su = 0;
    for (int i = 1; i <= n; i++) su += a[i] - i + 1;
    if (su % 2 == 1)
      puts("sjfnb");
    else
      puts("cslnb");
  }
  return 0;
}
