import java.io.*;
import java.util.*;
import java.math.*;

class Main135 {
	
	public static void out (Object out) {
		System.out.println(out);
	}
	
	public static void main (String[] args) throws IOException {
		BufferedReader br = 
			new BufferedReader(new InputStreamReader(System.in));
		
		int ans = Integer.MAX_VALUE;
		int n = Integer.parseInt(br.readLine());
		String[] line = br.readLine().split(" ");
		int[] nums = new int[n];
		
		for (int i = 0; i < n; i++) {
			nums[i] = Integer.parseInt(line[i]);
		}
		Arrays.sort(nums);
		
		boolean flg = false;
		for (int i = 1; i < n; i++) {
			if (nums[i] == nums[i - 1]) continue;
			flg = true;
			ans = Math.min(ans , nums[i] - nums[i - 1]);
		}
		
		out(flg ? ans : 0);
		
	}
}