import java.util.*;
public class minDifference {
public static void main(String[] args)
{
	Scanner in = new Scanner(System.in);
	int n=in.nextInt();
	long [] a = new long[n];
	for(int counter=0;counter<n;counter++)
		a[counter]=in.nextLong();
	Arrays.sort(a);
long min=Math.abs(a[1]-a[0]);
long cmp=0;
	for(int counter=1;counter<a.length;counter++)
	{
		if((cmp=Math.abs(a[counter]-a[counter-1]))<min)
		{
			min=cmp;
		}
	}
	System.out.println(min);
}
}