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 []arr = new int[n];
        
        for (int i = 0; i < n; i++) {
            arr[i] = in.nextInt();
        }
        
        Arrays.sort(arr);
        
        int minDiff = (int) Math.abs(arr[1] - arr[0]);;
        for (int i = 1; i < n; i++) {
            
            int absDiff = (int) Math.abs(arr[i] - arr[i - 1]);
            if (absDiff < minDiff) {
                minDiff = absDiff;
            }
        }
        System.out.println(minDiff);
    }
}