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[] a = new int[n];
		for (int i = 0; i < n; i++) {
			a[i] = in.nextInt();
		}
		in.close();
		
		Arrays.sort(a);
		
		int min = 0;
		
		for(int i=1; i<n; i++){
			int element1 = a[i];
			int element2 = a[i-1];
			int diff = element1 - element2;
			if(diff < 0){
				diff = diff * -1;
			}
			
			if(i == 1 || diff < min){
				min = diff;
			}
		}
		
		System.out.println(min);
    }
}