#include <stdio.h>
#include <math.h>
int main()
{
	double x1, y1, x2, y2, x3, y3;
	scanf_s("%lf%lf%lf%lf%lf%lf\n", &x1, &y1, &x2, &y2, &x3, &y3);
	double a, b, c;
	a = sqrt((abs(pow(x1 - x2,2))) + (abs(pow(y1 - y2,2))));
	b = sqrt((abs(pow(x1 - x3, 2))) + (abs(pow(y1 - y3, 2))));
	c = sqrt((abs(pow(x2 - x3, 2))) + (abs(pow(y2 - y3, 2))));
	double perimeter = a + b + c;
	double area = 1 / 2 * abs(x1*y2 - x2 * y1 - x3 * y2 + x2 * y3 + x3 * y1 - x1 * y3);
	char command;
	scanf_s("%c", &command);

	switch (command)
	{
	case 'u': printf("Umfang = %lf", perimeter); break;
	case 's': printf("Flaeche = %lf", area); break;
	default: printf("Ungueltig!");
		break;
	}
	system("pause");
	return 0;
}