#include

#include

using namespace std;

int main$()\{$

double x$1$;

double y$1$;

double x$2$;

double y$2$;

double xDist;

double yDist;

double pointsDistance;

xDist $=0\mathrm{.}0$;

yDist $=0\mathrm{.}0$;

pointsDistance $=0\mathrm{.}0$;

cin $>>$ x$1$;

cin $>>$ y$1$;

cin $>>$ x$2$;

cin $>>$ y$2$;

$/*$ Your solution goes here $*/$

cout $<<$ pointsDistance $<<$ endl;

return $0$;

$\}$