How do I use a for loop to produce the same result as below?

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Python3.6

I have made code to produce a NRIC checker but am not sure on how to apply for loop into this. The for loop is compulsory for my assignment.

What I have tried:

def main():

x = input("Enter your NRIC number here:")
if len(x) != 9:
print ("Please enter a legitimate NRIC.")
else:
first = int(x[1]) * int(2)
second =int(x[2]) * int(7)
third =int(x[3]) * int(6)
fourth= int(x[4]) * int(5)
fifth= int(x[5]) * int(4)
sixth= int(x[6]) * int(3)
seventh= int(x[7]) * int(2)
global y
y = (first + second + third + fourth + fifth + sixth + seventh)
h = int(y) % 11
b = 0
if h == 0:
b == "J"
elif h == 1:
b == "Z"
elif h == 2:
b == "I"
elif h == 3:
b == "H"
elif h == 4:
b == "G"
elif h == 5:
b == "F"
elif h == 6:
b == "E"
elif h == 7:
b == "D"
elif h == 8:
b == "C"
elif h == 9:
b == "B"
else:
b == "A"
if b == x[8]:
print ("Valid.")
else:
print("Invalid.")





main()