int main()
{
	char s[110], s1[110],
		 *sf1 = NULL, *sf2 = NULL,
		 *s11 = NULL;
	cin.getline(s,110);
	sf1 = s;
	sf2 = s + 1;
	s11 = s1;
	while(*sf2 != '\0')
	{
		*s11 = *sf1 + *sf2;
		s11++;
		sf1++;
		sf2++;
	}
	sf2 = s;
	*s11 = *sf1 + *sf2;
	*++s11 = '\0';
	cout << s1;
	return 0;
}