import java.util.*;

public class MinDif{
	Scanner inp;
	public MinDif(){
		inp = new Scanner(System.in);

	}
	public void start(){
	  System.out.print("Enter the size of array...");
		int n = inp.nextInt();
		int arr[] = new int[n];
		System.out.println("Enter the elements one by one... ");
		for(int i = 0; i < n; i++)
			arr[i] = inp.nextInt();
		Arrays.sort(arr);
		int m1 = arr[0], m2 = arr[1],d = m2 - m1;
		for(int i = 1; i < n-1; i++){
			if(d > arr[i+1] - arr[i]){
				d = arr[i+1] - arr[i];
				m1 = arr[i];
				m2 = arr[i+1];
			}
		}
		System.out.println("Elements : " + m1 + "," + m2);
		System.out.println("Minimum Difference : " + d);
	}
	public static void main(String[] args) {
		MinDif md = new MinDif();
		md.start();
	}
}