#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
#define int ll
#define fi first
#define se second
#define pb push_back
#define pf push_front
#define ppb pop_back
#define ppf pop_front
#define INF (ll)1e18

const int NMAX=1e2;
int a[NMAX+500];

signed main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    int n;
    cin>>n;
    for(int i=1;i<=n;i++)cin>>a[i];
    for(int i=n;i>=1;i--){
        //суфікс-паліндром довжини i
        bool ok=1;
        for(int ii=n-i+1;ii<=n;ii++)if(a[ii]!=a[n-(ii-(n-i+1))])ok=0;
        if(ok){
            cout<<n-i<<"\n";
            for(int ii=(n-i);ii>=1;ii--){
                cout<<a[ii]<<" ";
            }cout<<"\n";
            return 0;
        }
    }
}