#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("elmaj.in");
ofstream fout("elmaj.out");

long long int n, v[1000005], f[1000005], ap = 0;

int main()
{
    fin >> n;
    for(int i = 1; i <= n; i++)
    {
        fin >> v[i];
        f[v[i]]++;
    }
    for(int i = 1; i <= n; i++)
        if(f[v[i]] >= n / 2 + 1)
            {
                fout << v[i] << " " << f[v[i]];
                ap++;
                f[v[i]] = 0;
            }
    if(ap == 0)
        fout << -1;
    return 0;
}