#include <iostream>
#include <string>
#include <vector>

using namespace std;

const string alpha = "qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM";
//const string alpha = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

vector<string> parse (string str)
{
	int pos;
	vector<string> vec;

	while ((pos = str.find(',')) != string::npos)
	{
		vec.push_back(str.substr(0, pos));
		str = str.substr(pos + 1);
	}
	vec.push_back(str);
	return vec;
}

void choose_words(vector<string> vec, int n)
{
	vector<string> ans;
	for (int i = 0; i < vec.size(); ++i)
	{
		if(vec[i].length() >= n)
			ans.push_back(vec[i]);
	}
	for (int i = 0; i < ans.size() - 1; ++i)
		cout << ans[i] << ',';
	cout << ans[ans.size() - 1];

}

int main()
{
	string str;
	getline(cin, str);
	int n;
	cin >> n;

	vector<string> arr_of_words = parse(str);
	/*for (int i = 0; i < arr_of_words.size(); ++i)
		cout << arr_of_words[i] << endl;*/

	choose_words(arr_of_words, n);

	cout << endl;

	return 0;
}