import java.util.*;

public class Main {
	static Scanner sc = new Scanner(System.in);
	public static void main(String[] args) {
		int n = sc.nextInt();
		if (n==1) {System.out.println(0);}
		else {
			int[] ar = new int[n];
			for (int i=0; i<n; i++) {
				ar[i] = sc.nextInt();
			}
			Arrays.sort(ar);
			int min = Integer.MAX_VALUE;
			boolean F = false;
			for (int i=0; i<n-1; i++) {
				int temp = Math.abs(ar[i+1]-ar[i]);
				if (temp!=0) {min = Math.min(min,temp); F = true;}
			}
			System.out.println(F==true?min:0);
		}
	}
}