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 s = new Scanner (System.in);
		
		int numVals = s.nextInt();
		
		int [] nums = new int[numVals];
		
		for (int i = 0; i < nums.length; i++){
			nums[i] = s.nextInt();
		}
		
		Arrays.sort(nums);
		
		int min = Integer.MAX_VALUE;
		
		
		for(int i = 0; i< nums.length-1;i++){
			
			if (Math.abs(nums[i]-nums[i+1])<min){
				min= Math.abs(nums[i]-nums[i+1]);
			}
			
		}
		
		System.out.println(min);
    }
}