import java.util.Arrays;
import java.util.Scanner;

public class Rookie2 
{
	public static void main(String []args)
	{
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		int[] a = new int[n];
		for(int a_i=0; a_i < n; a_i++){
			a[a_i] = in.nextInt();
		}
		Arrays.sort(a);
		int min = Integer.MAX_VALUE;
		for(int i=0;i<n-1;i++)
		{
			if(Math.abs(a[i]-a[i+1])<min)
			{
				min = Math.abs(a[i]-a[i+1]);
			}

		}
		System.out.println(min);
	}

}