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#include <iostream>
#include <fstream>
#include <stdlib.h>
using namespace std;
const int N=1e7+1;
ifstream d("elmaj.in");
ofstream o("elmaj.out");
int main()
{
int *a,n,s=1,aux;
d>>n;
a=(int*)malloc(n*sizeof(int));
for(int i=0;i<n;i++)
d>>a[i];
aux=a[0];
for(int i=1;i<n;i++)
{
if(s==0)
{
aux=a[i];
s=1;
}
else if(a[i]==aux)
s++;
else
s--;
}
if(s==0)
o<<"-1";
else
{
s=0;
for(int i=0;i<n;i++)
if(aux==a[i])
s++;
if(s==n/2+1)
o<<aux<<' '<<s;
else
o<<"-1";
}
return 0;
}