length	A	U	C	G
16	0	0	0	0
17	1	0	1	0
18	2	2	0	0
19	6	0	2	1
20	14	3	4	0
21	7	2	5	3
22	15	10	4	9
23	13	5	13	3
24	12	6	3	3
25	9	8	9	1
26	12	3	0	0
27	5	4	3	1
28	4	1	2	2
29	4	3	1	1
30	2	1	0	2
31	2	0	2	1
32	0	0	0	0
33	0	0	2	0
34	1	0	0	0
35	0	0	0	1
36	1	0	0	0
37	0	0	0	0
38	0	0	0	0
39	0	0	0	0
40	0	0	0	0
41	0	0	0	0
42	0	0	0	0
43	0	0	0	0
44	0	0	0	0
45	0	0	0	0
46	0	0	0	0
47	0	0	0	0
48	0	0	0	0
49	0	1	0	0
50	0	1	0	0