Python: making one list that satisfies the condition

I have a csv file containing the following data:

1,1,3,2,2,1
2,1,3,2,1,1
3,2,4,2,7,3
4,1,3,2,3,1
5,3,3,1,1,1

and I would like to create a list that has the elements of sixth column which has 1 for second column. In short, the end result I would like is [1, 1, 1]

Here is the code I wrote:

input = open("C:\test.txt", "r")

for line in input.readlines():
    line = line.strip()
    no, grade, gpa, sex, preview, review = line.split(',')

    listno1 = []
    a = float(grade)
    if a == 1:
        listno1.append(int(review))

When I print, it turns out like this:

[]
[]
[]
[]
[1]
[2]
[]
[]
[4]
[]

Help please? And I would kind of like to stick to using lists. I'm a beginner so other codes are still a little confusing ;_; patience would be much appreciated!