#include <iostream>
#include<bits/stdc++.h>
#define ll long long
using namespace std;
int main()
{
ll n,i;
cin>>n;
ll x[n];
for(i=0;i<n;i++)
cin>>x[i];
sort(x,x+n);
ll sum=0;
for(i=0;i<n;i++)
sum+=x[i]-i;
if(sum%2==0)
cout<<"cslnb";
else
cout<<"sjfnb";
return 0;
}
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