#include <iostream>
#include <math.h>
using namespace std;

int main() {
	unsigned int N = 0;
	float Sum = 0, SquaredSum = 0, Input;

	cout << "Enter each of your numbers on a new line. Ctrl-Z or EOF marker to terminate." << endl;
	while (cin >> Input) {
		N++;
		Sum += Input;
		SquaredSum += (Input * Input);
	}

	float Mean = Sum / (float)N;
	float StdDev = sqrt((SquaredSum - ((float)N * Mean * Mean)) / (float)(N-1));
	cout << "Mean = " << Mean << endl
	     << "Standard Deviation = " << StdDev << endl;
	return 0;
}