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 a_i=0; a_i < n-1; a_i++){
            int abs = a[a_i+1] - a[a_i];
            if (abs < min) {
                min = abs;
                if (min == 0) {
                    System.out.println(min);
                    return;
                }
            }
        }
            
        System.out.println(min);
    }
}