import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static int minDiff(int[] nums) {
        
        Arrays.sort(nums);  //O(nlogn) sort
        
        int prev = -1;
        int curr = -1;
        int minDiff = Integer.MAX_VALUE;
        for (int i = 0; i < nums.length; i++) {
            prev = curr;
            curr = nums[i];
            int diff = Math.abs(curr - prev);
            if (diff < minDiff) {
                minDiff = diff;
            }
        }
        return minDiff;
    }
    
    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();
        }
        System.out.println(minDiff(a));
    }
}