#include <iostream>
#include <fstream>

using namespace std;

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

const int nMax = 1000000;
int frec[nMax];

int main()
{
    int n, maj;
    fin >> n;

    maj = n/2 +1;

    for(int i=0;i<n;i++){
        int nr;
        fin >> nr;
        frec[nr]++;
    }

    bool found = false;

    for(int i=0; i<n; i++){
        if(frec[i] >= maj){
            fout << i << ' ' << frec[i] << ' ';
            found = true;
        }
    }

    if(!found){
        fout << -1 << endl;
    }

    return 0;
}