package P135;

import java.io.*;
import java.util.Arrays;
import java.util.Scanner;

public class P135 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String n = sc.nextLine();
		int nint = Integer.parseInt(n);
		String l = sc.nextLine();
		String[] lstrs = l.split(" ");

		int lint[] = new int[nint];
		int i = 0;
		int cmax = nint - 1;
		
		for (i=0;i<=cmax;i++) {
			lint[i] = Integer.parseInt(lstrs[i]);
		}
		
		int j;
		int temp = 0;
		int ans = 1000000;
		int max = 0;
		int min = 1000000;
		
		Arrays.sort(lint);
		
		for (i=1;i<=cmax;i++) {
			temp = Math.abs(lint[i-1] - lint[i]);
			if (ans > temp && lint[i] != lint[i-1]) {
				ans = temp;
			}
			if (max < temp){
				max = temp;
			}
			if (min > temp) {
				min = temp;
			}
		}
		if (max == min) {
			ans = 0;
		}
/*		
		for (i=0;i<=max;i++) {
			for (j=i;j<=max;j++) {
				temp = Math.abs(lint[i]-lint[j]);
				if (ans > temp && lint[i] != lint[j]) {
					ans = temp;
					System.out.printf("%d %d %d %d %d\n",i,lint[i],j,lint[j],temp);
				}
			}
		}
*/
		System.out.println(ans);
	}
}