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 diff = a[1]-a[0];
for (int i = 2 ; i != n ; i++) {
    diff = Math.min(diff, a[i]-a[i-1]);
}
System.out.println(diff);
       
       }
}