#include <fstream>
using namespace std;
ifstream f("elmaj.in");
ofstream g("elmaj.out");
int n,nr,ok,v[10000009],A[10000009];
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<=n; i++)
        if(A[i] > n/2)
            g << i << " " << A[i] << '\n', ok = 1;
    if(ok != 1) g << -1 << '\n';

    g.close();
    return 0;
}