import java.util.Arrays;
import java.util.Scanner;


public class birds {
	public static void main(String[] args){
		Scanner eggo = new Scanner(System.in);
		int y= Integer.parseInt(eggo.nextLine()),p=Integer.MAX_VALUE;
		int[] birds=new int[y];
		String[] all = eggo.nextLine().split(" ");
		for(int i=0;i<y;i++)
			birds[i]=Integer.parseInt(all[i]);
		Arrays.sort(birds);
		for(int i=0;i<y-1;i++){
			if(birds[i+1]-birds[i]<p)
				p=birds[i+1]-birds[i];
		}
		System.out.println(p);
	}
}