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#include <fstream>
using namespace std;
ifstream f("elmaj.in");
ofstream g("elmaj.out");
int a[1000005];
int i,n,cand,k,nr;
int main()
{
f>>n;
for(i=1;i<=n;++i) f>>a[i];
cand=-1; k=0;
for(i=1;i<=n;++i)
{
if(k==0)
{
cand=a[i];
k=1;
}
else if(a[i]==cand) ++k;
else --k;
}
if(cand<0) g<<"-1"<<'\n';
else
{
nr=0;
for(i=1;i<=n;++i)
if(a[i]==cand) ++nr;
if(nr>n/2) g<<cand<<'\n'<<nr<<'\n';
else g<<"-1"<<'\n';
}
return 0;
}