while (getline(cin, str)) {
		string answer = "";
		int word_length = 0;
		for (char& a : str) {
			if ((a >= 'a' && a <= 'z') || (a == ' ') || (a >= 'A' && a <= 'Z') || (a >= '0' && a <= '9')) {
				if (a != ' ')
					word_length++;
				if (a >= 'A' && a <= 'Z') {
					char ch((int)a + 32);
					answer += ch;
				}
				else
					answer += a;
			}
			if (a == ' ') {
				// cout << answer << " " << word_length << endl;
				if (word_length <= 3) {
					for (int j = 0; j <= word_length; j++)
						answer.pop_back();
				}
				word_length = 0;
			}
		}
		if (word_length <= 3 && word_length > 0)
			for (int i = 0; i < word_length; i++)
				answer.pop_back();
		if (counter == 0)
			first_answer = answer;
		else
			second_answer = answer;
		counter++;
		cout << answer << endl;
	}