#include <iostream>
#include <vector>
#include <cmath>
using namespace std;

int main() {
	double a=0,s=0,z;
	int y;
	vector<int> x;
	while(cin>>z){
		x.push_back(z);
	}
	for (int i=0;i<x.size();i++){
		a+=x[i];
	}
	a=a/x.size();
	for (int i=0;i<x.size();i++){
		s=s+(a-x[i])*(a-x[i]);
	}
	s=s/(x.size()-1);
	s=sqrt(s);
	cout<<a<<" ";
	cout<<s<<" ";
	return 0;
}