package yukicoder135;
import java.util.Arrays;
import java.util.Scanner;
public class Main {
	public static void main(String[] args){
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
//		PriorityQueue<Integer> pq=new PriorityQueue(n);
		int[] pq=new int[n];
		for(int i=0;i<n;i++){
			pq[i]=sc.nextInt();
			}
		Arrays.sort(pq);
		int minInterbal=999999999;
		for(int i=0;i<n-1;i++){
			if(pq[i]==pq[i+1])continue;
			int interbal=Math.abs(pq[i]-pq[i+1]);
			minInterbal=Math.min(minInterbal, interbal);
		}
		if(minInterbal==999999999){
			System.out.println(0);
		}else{
			System.out.println(minInterbal);
		}
		
		
	}
}