How can I copy specif cell from one csv to another csv

[zoe1111]

Hi,
I want to copy 6th column from csv a to the 6th column in csv b. Besides copying, I want to add three blank rows after the copied one in csv b.

For example, if csv a 6th column has:

Output:
Event
1
p_o

csv b 6th column should have:

Output:
1
blank
blank
blank
p_o
blank
blank
blank

My codes copy 6th row in csv a to 4th row in csv b. It also cannot copy any word (e.g. "p_o"), but it can copy number (e.g. 1). Anyone knows how to fix these issues? Or how can I copy specific cell from one csv to the other? I am thinking if I should copy one cell from csv a and three blank cells from csv c to csv b.

Codes:

import csv
2	
3	def para(session, subj, groupnum):
4	    scorefile = str(groupnum) + str('Asns')
5	    print("scorefile: %s" % scorefile)
6	    scoreart = str(groupnum) + str('AK5s')
7	    print("scoreart: %s" % scoreart)
8	 
9	    new_score=r'K:\users\zoey\artscore\\'+scoreart+r'.csv'
10	    New_score_csv=open(new_score,'w')
11	 
12	    score_data=r'K:\users\zoey\\'+scorefile+r'.csv'
13	    print(score_data)
14	 
15	    with open (score_data) as a, open(new_score,'w') as b:
16	        b.write(next(a))
17	        ca=csv.reader(a)
18	        ca_rows=list(a)
19	        cb=csv.writer(b)
20	
21	        for row in range(len(ca_rows)):
22	            cb.writerow(([" "]*3)+[ca_rows[row][-2]]) # replace -2 with actual col if delimiter is working
23	            cb.writerow([" "]*3)

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Thanks for your help! Will do next time