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 minAbsVal = Math.abs(a[0] - a[1]); for (int i = 1; i < n - 1; i++) { int newAbsVal = Math.abs(a[i] - a[i + 1]); if (newAbsVal < minAbsVal) { minAbsVal = newAbsVal; } } System.out.println(minAbsVal); } }