import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    static int getMinAbsDifference(int[] array)
        {
        Arrays.sort(array);
        return getMinAbsOfAdj(array);
    }
    
    static int getMinAbsOfAdj(int[] array)
        {
        int minDiff = Integer.MAX_VALUE;
        
        for(int i=0;i<array.length-1;i++)
            {
            int diff = Math.abs(array[i] - array[i+1]);
            if(diff<minDiff)
                {
                minDiff = diff;
            }
        }
        
        return minDiff;
    }
    
    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();
        }
        
        System.out.println(getMinAbsDifference(a));
        // your code goes here
    }
}