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 minDiff = a[1] - a[0];
        
        for (int i = 1; i < a.length; i++) {
        	int diff = a[i] - a[i - 1];
        	
        	if (diff < minDiff) {
        		minDiff = diff;
        	}
        }
        
        System.out.println(minDiff);
    }
}