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

public class CutSticks {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int[] arr=new int[n];
		for (int i = 0; i < n; i++)
			arr[i] = sc.nextInt();
		Arrays.sort(arr);
		int min = 2000000000;
		for (int i = 0; i < n - 1; i++) {
			if(Math.abs(arr[i]-arr[i+1])<=min)
				min=Math.abs(arr[i]-arr[i+1]);
		}
		System.out.println(min);
	}

}