import java.util.*;
class absalute
{
	public static void main(String ar[])
	{
		Scanner sc= new Scanner(System.in);
		int n= sc.nextInt();
		long arr[]= new long[n];
		for(int i=0; i<n; i++)
		{
			arr[i]= sc.nextLong();
		}
		Arrays.sort(arr);
		long diff= Integer.MAX_VALUE;
		long temp=0;
		for(int i=0; i<n-1; i++)
		{
			if(Math.abs(arr[i]-arr[i+1])<diff)
			{
				diff= Math.abs(arr[i]-arr[i+1]);
			}	
		}
		System.out.println(diff);
	}	
}