#include <iostream>
#include <fstream>
using namespace std;
ifstream f("numere.in");
 
int main()
{
    int x, y, lmax=1, l=1, amax, a, rmax, r,n;
    bool ok=false;
    cin>>n;
    cin>>x;
    while (cin>>y && n!=0)
    {
        if (ok=false)
        {
            ok=true;
            l=1; a=x;
            r=y-x;
        }
        else
        { if (y-x==r) l++;
            else 
            {
                ok=false;
                if (l>lmax) lmax=l; amax=a; rmax=r;
            }
        }
        x=y;
    }
    while (lmax)
    {
        cout<<amax<<" ";
        amax=amax+r;
        lmax--;
    }
 
    return 0;
}

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