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#include <fstream>
using namespace std;
int v[1000000];
int main()
{
ifstream cin ("elmaj.in");
ofstream cout ("elmaj.out");
int n, cnt, c, ap;
cin>>n;
cnt=0;
ap=0;
for (int i=0; i<n; i++)
cin>>v[i];
for (int i=0; i<n; i++)
{
if (cnt==0)
{
c=v[i];
cnt++;
}
else
{
if (v[i]==c)
cnt++;
else
cnt--;
}
}
for (int i=0; i<n; i++)
{
if (v[i]==c)
ap++;
}
if (ap==n/2+1)
cout<<c<<" "<<ap;
else
cout<<-1;
return 0;
}