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) throws IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(in.readLine());
        
        StringTokenizer st = new StringTokenizer(in.readLine());
        
        int[] a = new int[n];
        for(int a_i=0; a_i < n; a_i++){
            a[a_i] = Integer.parseInt(st.nextToken());
        }
        
        Arrays.sort(a);
        
        int least=1000000001;
        
        for(int i=0; i < n-1; i++){
            if(a[i+1]-a[i]<least) least=a[i+1]-a[i];
        }
        System.out.println(least);
        // your code goes here
    }
}