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global str[32];

main() {
	strappend('H');
	strappend('e');
	strappend('l');
	strappend('l');
	strappend('o');
	strappend(' ');
	strappend('W');
	strappend('o');
	strappend('r');
	strappend('l');
	strappend('d');
	strappend('!');
	strappend('\n');

	print(str);
}

strappend(c) {
	local s;
	s = str;
	loop {
		if ([s] == 0)
			break;
		s = s + 1;
	}
	[s] = c;
}

print(s) {
	loop {
		if ([s] == 0)
			break;
		wrt [s];
		s = s + 1;
	}
}