char* get_input() {
  int buffer_size = 10;
  char* buffer = malloc(buffer_size);
  char* new_buffer;
  int position = 0;

  if(buffer == NULL) {
    return 0;
  }

  int character;
  while(character = getc(stdin), character != EOF && character != '\n') {
    buffer[position++] = character;

    if(position > buffer_size) {
      buffer_size *= 2;
      new_buffer = realloc(buffer, buffer_size);
      if(new_buffer == NULL) {
        free(buffer);
        return 0;
      } else {
        buffer = new_buffer;
      }
    }
  }

  buffer[position] = 0;

  return buffer;
}

int main() {
  puts(get_input());
}