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 n = s.nextInt();
		int[] arr = new int[n];
		for(int i=0;i<n;i++){
			arr[i] = s.nextInt();
		}
		s.close();
		Arrays.sort(arr);
		int min = 10000000;
		for(int i=0;i<n&&i+1<n;i++){
			
			int diff = Math.abs(arr[i+1]-arr[i]);
			if(diff<min){
				min = diff;
			}
		
		}
		System.out.println(min);

	}
    
}