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