#include <iostream>
#include <fstream>
using namespace std;
int main()
{    int n,i,x[100],nr,m,nr1;
 ifstream f("elmaj.in");
ofstream g("elmaj.out");
    f>>n;nr1=0;
    for(i=1;i<=n;i++)
        f>>x[i];
    nr=1;
    for(i=1;i<=n;i++)
    {m=x[1];
        if(x[i]==m)
            nr++;
        if(nr<0)
        {nr=1;m=x[i];}}
    for(i=1;i<=n;i++)
        if(x[i]==m)
            nr1++;
    if(nr1==n/2+1)
        g<<m<<" "<<nr1;
    else
        g<<"-1";
    return 0;
}