[Python] List index function behaving wrongly and keeps setting index to 0 [closed]

pfz0 = ["","centi","milli","micri","nani","pici","femti"] # z for zeta
illion = ["llion","illion"]

a0_ni = input("first 3 digits:")

a0 = int(a0_ni) # femti

b0_ni = input("next 3 digits:")

b0 = int(b0_ni) # pici

c0_ni = input("next 3 digits :")

c0 = int(c0_ni) # nani

d0_ni = input("next 3 digits :")

d0 = int(d0_ni) # micri

e0_ni = input("next 3 digits:")

e0 = int(e0_ni) # milli

f0_ni = input("next 3 digits :")

f0 = int(f0_ni) # centi

zl = [f0,e0,d0,c0,b0,a0]

if isinstance(a0,int) and isinstance(b0,int) and isinstance(c0,int) and isinstance(d0,int) and isinstance(e0,int) and isinstance(f0,int) and a0 < 1000 and b0 < 1000 and c0 < 1000 and d0 < 1000 and e0 < 1000 and 10 < f0 < 1000:

print(pfz0[int(zl.index(a0))+1]+pfz0[zl.index(b0)+1]+pfz0[zl.index(c0)+1]+pfz0[zl.index(d0)+1]+pfz0[zl.index(e0)+1]+illion[0])

elif zl == [0,0,0,0,0,0]:

print("zero")

print("10^-inf")

else:

print("error")


here's the code. for some reason, it keeps returning the wrong result. The result it gives is what you would get if zl.index(literally anything in zl) = 0. but it's very clearly not. This only happens if I input repeated numbers for a0,b0,c0,d0,e0,f0(e.g. 555,555,555,555,555,555)otherwise, the code works fine. What's the problem?

Whenever I input the same repeated digit for a0,b0,c0,d0,e0,f0, instead of getting the following:

femtipicinanimicrimillicenti

[this is what I should get by the way]

I get this instead:

centicenticenticenticenticenti

(which is NOT what I should be getting)

I can't think of anything to fix this. Please help

I am very confused. Tbh I couldn't think of anything to try so I just gave up and came here. All I kind of did is just check for typos, but there wasn't any. I checked about 15 times by now and not a single typo. I've checked my indentation, and everything is properly indented.

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