#include<bits/stdc++.h>
#define fs ios_base::sync_with_stdio (0); cin.tie(0)
#define por(i,a,b) for(ll i=a;i<b;i++)
#define fp(ch) freopen(ch,"r",stdin)
#define ll long long
#define pb(x) push_back(x)
#define S second
#define f first
#define N 100005
#define OO 1000000000000000000
#define mod 1000000007
#define pi acos(-1)
#define EPS 0.000000001
using namespace std;



int main(){
    fs;
    ll n,x=-1,moves=0;
    cin>>n;
    ll t[n];
    map<ll,ll> m;
    por(i,0,n){
        cin>>t[i];
        m[t[i]]++;
        if(m[t[i]]>2){
            cout<<"cslnb";
            return 0;
        }
        if(m[t[i]]==2){
            if(x!=-1 || t[i]==0){
                cout<<"cslnb";
                return 0;
            }else{
                moves++;
                t[i]--;
                x=t[i];
            }
        }
    }
    if(m[x]){
        cout<<"cslnb";
        return 0;
    }
    sort(t,t+n);
    //por(i,0,n) cout<<t[i] <<" ";cout<<endl;
    por(i,0,n){
        moves+=(t[i]-i);
    }
    if(moves%2) cout<<"sjfnb";
        else cout<<"cslnb";
return 0;}