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();
        }
        // your code goes here
        in.close();
        
        Arrays.sort(a);
        int min = Math.abs(a[1]-a[0]);
        int arr[] = new int[n];
        for (int i = 1; i < n-1; i++) {
			int tmp =  Math.abs(a[i+1]-a[i]);
			if(tmp<min) min = tmp;
		}
        
        System.out.println(min);
    }
}