#include <iostream>
int main()
{
double x1, y1, x2, y2;
std::cout << "M(x1,y1): ";
std::cin >> x1 >> y1;
std::cout << "N(x2,y2): ";
std::cin >> x2 >> y2;
if ((x1 - 1) * (x1 - 1) + (y1 + 2) * (y1 + 2) == 4) std::cout << "M(" << x1 << "," << y1 << ")";
else if ((x2 - 1) * (x2 - 1) + (y2 + 2) * (y2 + 2) == 4) std::cout << "N(" << x2 << "," << y2 << ")";
else std::cout << "None of the points";
return 0;
}
x: real;
y: integer;
i, k: byte;
begin
readln(y);
k := length(inttostr(y));
x := 0;
foreach o: char in inttostr(y) do
x += sqr(strtofloat(o));
x *= 1 / k;
writeln(sqrt(x));
end.