import java.io.*; import java.util.*; import java.text.*; import java.math.*; import java.util.regex.*; public class Solution { 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 diff = a[1]-a[0]; for (int i = 2 ; i != n ; i++) { diff = Math.min(diff, a[i]-a[i-1]); } System.out.println(diff); } }