#include <stdio.h>
#include <math.h>
int main(void) {
printf("type in four values:\n");
double x1,y1,x2,y2,distance;
scanf("%lf %lf %lf %lf",&x1,&y1,&x2,&y2);
distance=(x2-x1)*(x2-x1) + (y2-y1)*(y2-y1);
distance=sqrt(distance);
printf("%lf %lf %lf %lf\n",x1,y1,x2,y2);
printf("%lf\n",distance);
return 0;
}