Trunchbull - Crack the code

Crack the Code!
i		c	a	n	n	o	t		f	o	r		t	h	e		l	i	f	e		o	f
18		24	26	13	13	12	7		21	12	9		7	19	22		15	18	21	22		12	21
m	e		u	n	d	e	r	s	t	a	n	d		w	h	y		s	m	a	l	l
14	22		6	13	23	22	9	8	7	26	13	23		4	19	2		8	14	26	15	15
c	h	i	l	d	r	e	n		t	a	k	e		s	o		l	o	n	g		t	o
24	19	18	15	23	9	22	13		7	26	16	22		8	12		15	12	13	20		7	12
g	r	o	w		u	p	.		i		t	h	i	n	k		t	h	e	y		d	o		i	t
20	9	12	4		6	11			18		7	19	18	13	16		7	19	22	2		23	12		18	7
d	e	l	i	b	c	r	a	t	e	l	y		j	u	s	t		t	o		a	n	n	o	y
23	22	15	18	25	22	9	26	7	22	15	2		17	6	8	7		7	12		26	13	13	12	2
m	e	.
14	22
Key		Use the key to crack the code above!
a	b	c	d	e	f	g	h	i	j	k	l	m	n	o	p	q	r	s	t	u	v	w	x	y	z
26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1