import java.util.*;
public class DistanceFormula
{

	public static void main(String[]args)
	{
	Scanner scan=new Scanner(System.in);
	System.out.print("Enter Coords: ");
	ArrayList<Double> coords=new ArrayList<Double>();
	String coordinates=scan.next();
	System.out.print(distance(coordinates));
	}
	public static double distance(String coordinates)
	{
		double[] nums=new double[coordinates.length()];
		for(int i=0;i<coordinates.length();i++)
		{
			if(coordinates.charAt(i)==(' ')||coordinates.charAt(i)==(')')||coordinates.charAt(i)==('(')||coordinates.charAt(i)==(','))
			nums[0]=Double.valueOf(i++);
		}
		double dist=Math.sqrt(Math.pow(nums[0]-nums[2], 2))+(Math.pow(nums[1]-nums[3], 2));
		return dist;
	}
}