#include <iostream>
#include <cmath>

using namespace std;

int main() {

	double x,y;
	char junk;

	// Get input point
	cout << "Please enter a point as in (4.5,3.8): ";
	cin  >> junk;   // read left paren
	cin  >> x;      // get x value
	cin  >> junk;   // get comma
	cin  >> y;      // get y value
	cin  >> junk;   // get right paren

	// Compute length
	double answer;
	answer = sqrt(x*x+y*y);

	// Output results
	cout << "The length is: " << answer << endl;

	return 0;
}