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