import java.util.*;
import java.lang.*;

class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
int[] a = new int[] {4, 9, 1, 32, 13};
Arrays.sort(a);
int minDiff = a[1]-a[0];
for (int i = 2 ; i != a.length ; i++) {
    minDiff = Math.min(minDiff, a[i]-a[i-1]);
}
System.out.println(minDiff);
	}
}