import java.io.*;

import java.util.*;

import java.text.*;

import java.math.*;

import java.util.regex.*;

public class Solution {

public static void main(String[] args) throws IOException {

BufferedReader ob = new BufferedReader(new InputStreamReader(System.in));

int n = Integer.parseInt(ob.readLine());

BigInteger [] array = new BigInteger [n];

String [] tmp = ob.readLine().split(" ");

for (int i = 0; i < n; i++) {

array[i] = new BigInteger(tmp[i]);

}

Arrays.sort(array);

BigInteger minDiff = new BigInteger(Integer.MAX_VALUE+"");

int minIndex = 1;

for (int i = 1; i < n; i++) {

if (minDiff.compareTo(array[i].subtract(array[i-1])) > 0) {

minDiff = array[i].subtract(array[i-1]);

minIndex = i;

}

}

StringBuilder builder = new StringBuilder();

for (int i = 1; i < n; i++) {

if (minDiff.equals(array[i].subtract(array[i-1]))) {

builder.append(array[i-1] + " " + array[i] + " ");

}

}

System.out.print(builder.toString().trim());

}

}