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//
// main.cpp
// elmaj+
//
// Created by Catalina Brinza on 12/12/13.
// Copyright (c) 2013 Catalina Brinza. All rights reserved.
//
#include <fstream>
#include <unordered_map>
using namespace std;
unordered_map <int, int> has;
ifstream f("elmaj.in");
ofstream g("elmaj.out");
int main()
{int n,i,max=-1,x;
f>>n;
for (i=0;i<n;++i)
{
f>>x;
has[x]++;
if (has[x]==(n>>1)+1)
{
g<<x<<' ';
max=x;
}
}
if (max!=-1) g<<has[max];
else g<<-1;
return 0;
}