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();
        }
        // your code goes here
        int ansArray[] = new int[(n*(n-1)/2)];
        //int ans = Math.abs(a[0]-a[1]);
        int k = 0;
        for(int i = 0; i < a.length; i++){
            for(int j = i+1; j <= a.length-1; j++){
                ansArray[k++] = Math.abs(a[i] - a[j]);
            }
        }
        
        /*if(Math.abs(a[i]-a[j]) < ans){
                    ans = Math.abs(a[i]-a[j]);
                }
        /*int ans = Math.abs(a[0]-a[1]);
        while(a.length >= 2){
            for(int i = 1; i < a.length; i++){
                if(Math.abs(a[0]-a[i]) < ans){
                    ans = Math.abs(a[0]-a[i]);
                }
            }
            int[] newA = new int[a.length-1];
            for(int i = 0; i < newA.length; i++){
                newA[i] = a[i+1];
            }
            a = newA;
        }*/
       // Arrays.sort(ansArray);
        //System.out.println(ansArray[0]);
    // }
    
    /*public static int sum(int n){
        int ans = 0;
        for(int i = n; i>=0; --i){
            ans += i;
        }
        return ans;
    }*/

    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();
        }
        // your code goes here
        int value = Integer.MAX_VALUE;
        Arrays.sort(a);
        for(int i=1;i<n;i++){
            if(Math.abs((a[i-1]-a[i])) < value)
                value = Math.abs((a[i-1]-a[i]));
        }
        System.out.println(value);
    }
    
}