Problem:
Distance

Write a program which calculates the distance between two points P1(x1, y1) and P2(x2, y2).

Input

Four real numbers x1, y1, x2 and y2 are given in a line.

Output

Print the distance in real number. The output should not contain an absolute error greater than 10-4.

Sample Input

0 0 1 1

Sample Output

1.41421356

Solution in JavaScript (judge verdict: Accepted)

const [x1,y1,x2,y2] = require('fs').readFileSync('/dev/stdin', 'utf8').split(/\s/);
var a = Math.sqrt( Math.pow( x2-x1, 2 ) + Math.pow( y2-y1, 2 ) ) ;
console.log(a.toFixed(8));