>>110
import java.io.*;
public class Res110 {
public static void main(String[] args) throws IOException {
BufferedReader r = new BufferedReader(new InputStreamReader(System.in));
String s;
int n = 0;
double m1 = 0, m2 = 0;
try {
while ((s = r.readLine()) != null) {
for (String t : s.split("[\\s,]")) {
double d = Double.parseDouble(t);
m1 += d;
m2 += d * d;
n++;
}
}
} catch (NumberFormatException e) {
} finally {
r.close();
}
System.out.println("入力された数値の個数 " + n);
if (n > 0) {
m1 /= n;
m2 /= n;
System.out.println("平均 " + m1);
System.out.println("分散 " + (m2 - m1 * m1));
System.out.println("標準偏差 " + Math.sqrt(m2 - m1 * m1));
}
}
}