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

public class Solution {
    public static int getMinimumDifference(int ... numbers){
		int minimumDifference = Integer.MAX_VALUE, temp = 0;
		for(int i = 0; i < numbers.length; i++){
			if(i < numbers.length-1){
				int[] subArray = Arrays.copyOfRange(numbers, i+1, numbers.length);
				for(int j = 0; j < subArray.length; j++){
					temp = Math.abs(numbers[i]-subArray[j]);
				}
				if(temp < minimumDifference){
					minimumDifference = temp;
				}
			}
			
		}
		return minimumDifference;
	}

    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
        System.out.println(getMinimumDifference(a));
    }
}