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(); } int min = Integer.MAX_VALUE; Arrays.sort(a); for(int i = 1; i < n; i++) { int num = Math.abs(a[i-1] - a[i]); if(num < min) min = num; } System.out.println(min); } }