#include <iostream>

using namespace std;

char *resize(const char *str, unsigned size, unsigned new_size);
char *getline();

 int main()
{
	setlocale(LC_ALL, "Russian");
        char *b = getline();
	return 0;
}

char *resize(const char *str, unsigned size, unsigned new_size)
{
	char* ans = new char[new_size];
	for (int i = 0; i < size, i < new_size; ++i) {
		*(ans + i) = *(str + i);
	}
	delete[] str;
	return ans;
	/* ... */
}

char *getline()
{
	char c; 
	char * res = new char[0];
	int i = 0;
	unsigned size;
	unsigned new_size;
	//while (std::cin.get(c) && c != '\n' && c != std::cin.eof()){
	while (cin.get(c)) {
		if (c == '\n') {
			break;
		}
		if (i > 0) {
			size = i - 1;
			new_size = (++i) - 1;
			res = resize(res, i, new_size);
			res[i] = c;
		}else {
			res[i] = c;
			++i;
		}
	}
	if (i > 0) res = resize(res, i, ++i);
	res[i] = '\0';
	return res;
}

char *getline()
{
	char c; 
    int i = -1;
	int sise = 1;
	char * res = new char[sise];
	while (cin.get(c) && c != '\n' && c != cin.eof()){
		res[++i] = c;
		res = resize(res, sise, ++sise);
	}
	res = resize(res, sise, ++sise);
	res[++i] = '\0';
	return res;
}