import java.io.*;
import java.util.Arrays;
import java.util.Scanner;
import java.util.StringTokenizer;
import java.lang.Math;


public class ADALAb3 {
	 public static void main(String[] args) throws IOException {
		BufferedReader input=new BufferedReader(new InputStreamReader(System.in));
		String n1=input.readLine();
		int n2=Integer.parseInt(n1);
		String s1=input.readLine();
		int[] array=new int[n2];
		StringTokenizer str=new StringTokenizer(s1);
		for(int p=0;p<n2;p++){
			array[p]=Integer.parseInt((String)str.nextElement());
		}
		//for(int h=0;h<n2;h++)
		//	System.out.println(array[h]);
		Arrays.sort(array);
		int m=Math.abs(array[0]-array[1]);
		for(int i=0;i<n2-1;i=i+1){
			int s=Math.abs(array[i]-array[i+1]);
			//int k=Character.getNumericValue(s1.charAt(l+2));
			//int n=Math.abs(s-k);
			//l=l+2;
			if(s<=m)
				m=s;
		}
		System.out.print(m);
	 }
}