# Automatic Ball Machine

## Introduction

A tennis ball machine sits on the center mark of a tennis court, as shown below. It shoots balls randomly on the other side of the court. The position of the ball machine is (0, 0):

Write a program to find the distance from the ball machine to a given point on the court.

## Input

Read the input one line at a time. Each line contains an (x, y) coordinate. The last line of input contains a 0 0, do not process this line

3 4
6 8
8 8
2 3
0 0


## Output

Find the distance from the ball machine to a given cordinate (x, y) on the court, rounded to two decimal places.

5.00
10.00
11.31
3.61