#include <iostream>
using namespace std;
 
// Ref: http://w...content-available-to-author-only...s.com/reference/iterator/istreambuf_iterator/
// Ref: http://w...content-available-to-author-only...s.com/reference/istream/istream/sentry/
// Ref: http://w...content-available-to-author-only...s.com/reference/istream/istream/
 
char *buffer_realloc(char *buf, size_t oldSize, size_t newSize)
{
	if (oldSize == newSize)
	{
		return buf;
	}
 
	char *newBuf = nullptr;
	size_t count = 0;
 
	if (oldSize > newSize)
		count = newSize;
	else
		count = oldSize;
 
	newBuf = new char[newSize];
	std::copy(buf, buf + count, newBuf);
 
	delete[] buf;
	return newBuf;
}
 
istream& getline(istream& is, char *&buffer)
{
	std::istream::sentry s(is);
	if (s)
	{
		std::istreambuf_iterator<char> it(is);
		std::istreambuf_iterator<char> end;
 
		size_t size = 4;
		size_t grow = 4;
		size_t len  = 0;
 
		buffer = new char[size];
 
		while (it != end && *it != '\n') 
		{
			if (len == (size - 1)) 
			{
				buffer = buffer_realloc(buffer, size, size + grow);
				size += grow;
			}
 
			buffer[len++] = *it++;
		}
 
		buffer[len] = '\0';
	}
 
	return is;
}
 
int main() 
{
	char *line = nullptr;
	while (getline(std::cin, line))
	{
		if (line) 
		{
			cout << line << endl;
			delete[] line;
		}
	}
 
	return 0;
}

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line1 line 1 line1 line 1 1 1 1 111
line 2    line 2 222 2 2 222 
line 3 3 3 33 3
line 4 4 4 44444 4