#include <fstream>
using namespace std;
ifstream f("elmaj.in");
ofstream g("elmaj.out");
int n,nr,ok,v[1000001],A[1000001];
int main()
{
    f >> n;
    for(int i=1; i<=n; i++)
        f >> v[i];

    for(int i=1; i<=n; i++)
        A[v[i]]+=1;

    for(int i=1; i<=1000001; i++)
        if(A[i] > n/2) g << i << " " << A[i] << '\n', ok = 1;

    if(ok == 0) g << -1 << '\n';
    g.close();
    return 0;
}