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

public class Solution {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int size = in.nextInt();
        in.nextLine();
        
        String[] array = in.nextLine().split("\\s");
        Arrays.sort(array);
        List<String> arrayList = Arrays.asList(array);
        List<Integer> absoluteValues = new ArrayList<>();
        long maxValue = 1000000000;
        
        for (int i = 1; i < size; i++) {
            int x = Integer.valueOf(arrayList.get(i-1));
            int y = Integer.valueOf(arrayList.get(i));
            int result = Math.abs(x - y);
            if (result < maxValue)
                maxValue = result;
        }
        
        System.out.println(maxValue);
    }
}