/***************************************************
Length of Vectors

Write a program that reads in a vector in the form
(x,y), and writes out the length of the vector.

In high school math, a vector is usually a pair
(x,y), where x and y are real numbers.  The length
or magnitude of a vector is 
  _________
\/x^2 + y^2.
***************************************************/
#include <iostream>
#include <cmath>
using namespace std;

int main()
{
  // read pair
  char c;
  double x, y;
  cin >> c; // reads (
  cin >> x; 
  cin >> c; // reads ,
  cin >> y;
  cin >> c; // reads )
  
  // compute magnitude
  double m;
  m = sqrt(x*x + y*y);

  // write out result
  cout << "The magnitude is " << m << endl;

  return 0;
}