import java.util.Scanner;

public class AbsuluteDiference {
	public static void main(String arg[])
	{
		Scanner scanner=new Scanner(System.in);
		int n=scanner.nextInt();
		
		int arr[]=new int[n];
		for(int p=0;p<n;p++)
		{
			arr[p]=scanner.nextInt();
		}
		int min=arr[0];
		for(int i=1;i<=n;i++)
		{
			for( int j=1;j<n;j++)
			{
			int a=Math.abs(arr[j-1]-arr[j]);
			if(a<min)
			{
				min=a;
			}
			}
		}
		System.out.println(min);
	}

}