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];
        
        // ArrayList<Integer>=new ArrayList<Integer>(n);
        PriorityQueue<Integer> queue = new PriorityQueue<Integer>(n);
        
        for(int a_i=0; a_i < n; a_i++){
            queue.add(in.nextInt());
            // a[a_i] = in.nextInt();
            
        }
        long element;
        long last = queue.remove();
        long difference = Long.MAX_VALUE;
        while(!queue.isEmpty()) {
            element = queue.remove();
            if(element-last<difference) difference=element-last;
            last=element;
        }
        // your code goes here
        System.out.println(difference);
        
    }
}