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global str[32];

main() {
	local i;

	strappend(str, 'H');
	strappend(str, 'e');
	strappend(str, 'L');
	strappend(str, 'l');
	strappend(str, 'o');
	strappend(str, ' ');
	strappend(str, 'W');
	strappend(str, 'o');
	strappend(str, 'R');
	strappend(str, 'l');
	strappend(str, 'd');
	strappend(str, '!');
	strappend(str, '\n');

	i = 0;
	loop {
		i = i + 1;
		if (i > 9)
			break;
		print(str);
		uprint(str);
	}
}

strappend(s, c) {
	loop {
		if ([s] == 0) {
			[s] = c;
			return 0;
		}
		s = s + 1;
	}
}

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

uprint(s) {
	loop {
		if ([s] == 0)
			return 0;
		wrt toupper([s]);
		s = s + 1;
	}
}

nl() {
	wrt '\n';
}

toupper(c) {
	if (c >= 'a' & c <= 'z')
		return c - 32;
	return c;
}

fast_toupper(c) {
	return c - 32 * (c >= 'a' & c <= 'z');
}