#include <cstdio>
#include <algorithm>
using namespace std;
int a[1000005];
int main () {
	int i,n,k=n/2+1,c=0;
	freopen("elmaj.in","r",stdin);
	freopen("elmaj.out","w",stdout);
	scanf("%d %d",&n);
	for(i=1;i<=n;++i)scanf("%d",&a[i]);
	nth_element(a+1,a+k,a+n+1);
	for(i=1;i<=n;++i){
		if(a[i]==a[k]){
			c=c+1;
		}
	}
	if(c>n/2){
	printf("%d",a[k],c);
	return 0;
	}
	printf("-1");
	return 0;
}