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#include <fstream>
using namespace std;
ifstream f("elmaj.in");
ofstream g("elmaj.out");
int v[3000001];
int main()
{int i,nr,n,el,nr3,nr2=0;
f>>n;
for(i=1;i<=n;i++)
f>>v[i];
nr3=v[1];
for(i=1;i<=n;i++)
{
if(v[i]==nr3)
nr++;
else
nr--;
if(nr<=1)
{
nr3=v[i];
nr=1;
i--;
}
}
if(nr>1)
for(i=1;i<=n;i++)
{
if(v[i]==nr3)
nr2++;
}
if(nr2==n/2+1)
g<<nr3<<" "<<nr2;
else
g<<"-1";
return 0;
}