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

int main()
{
    ifstream f("elmaj.in");
    ofstream g("elmaj.out");
    int n,p,x[10],z=0,i;
    f>>n;n=n/2+1;
    for (i=0;i<=9;i++) x[i]=0;
    while (f>>p) {for (i=0;i<=9;i++){ if (i==p) x[i]++;}}
    for (i=0;i<=9;i++) if (x[i]>=n) { g<<i<<" "<<x[i];z=1;}
    if (z==0)g<<-1;

    f.close();
    g.close();
    return 0;
}