import java.util.*;

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); return;
		}
		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;
			for (int i=1; i<n; i++) {
				if (ar[i]-ar[i-1] != 0) {
					min = Math.min(min, ar[i]-ar[i-1]);
				}
			}
			System.out.println(min==Integer.MAX_VALUE?0:min);
		}
		
	}
}