#include <stdio.h>

main()
{
	float x0, y0, x1, y1;

	printf("Input two positions:(x0, y0), (x1, y1)\n");
	scanf("(%f, %f), (%f, %f)", &x0, &y0, &x1, &y1);
	printf("Distance=%f\n", sqrt(pow(x1-x0,2), pow(y1-y0,2));
}