Problem: 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.

Example

Input

0 0 1 1


Output

1.41421356

Solution (in CPP):

Solution:
#include <cmath>
#include <cstdio>

int main(){
    double x1, x2, y1, y2;
    scanf("%lf %lf %lf %lf", &x1, &y1, &x2, &y2);
    printf("%lf\n", sqrt((x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2)));
    return 0;
}