#include <iostream>
#include <sstream>
#include <string>
using namespace std;

int main() {

	istringstream iss("2.832 1.3067 nana 1.678");
	double num = 0;
	while(iss >> num || !iss.eof()) {
		if(iss.fail()) {
			iss.clear();
			string dummy;
			iss >> dummy;
			continue;
		}
		cout << num << endl;
	}
	return 0;
}