#include <fstream>
#include <vector>
using namespace std;

ifstream is("elmaj.in");
ofstream os("elmaj.out");

int n;
int a[100002];
int nr = -1;
int k = 0;

int main()
{
    is >> n;
    for(int i = 1; i <= n; ++i)
        is >> a[i];

    for(int i = 1; i <= n; ++i)
    {

        if( k == 0)
        {
            nr = a[i];
            k = 1;
        }
        else if(a[i] == k)
        {
            k++;
        }
        else
            k--;
    }
    if(nr >= 0)
    {
        int cnt = 0;
        for(int i = 1; i<= n; ++i)
        {
            if(a[i] == nr)
                cnt++;
        }
        if(cnt > n/2)
            os << nr << ' ' << cnt;
    }
    else
        os << -1;
    is.close();
    os.close();
    return 0;
}