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[]) throws Exception{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String readLine = br.readLine();
		int[] array = Arrays.stream(br.readLine().split(" "))
				.mapToInt(x->Integer.parseInt(x))
				.sorted()
				.toArray();
		int min = array[1]-array[0];
		for (int i = 2 ; i != array.length ; i++) {
		    min = Math.min(min, array[i]-array[i-1]);
		}
		System.out.println(min);
	}

}