Python: 'string index out of range'

Question

I had a quick search but couldn't find anything that helped my problem.

I'm trying to make a program that takes the first 5 numbers and sources their product, and if that product is the largest found thus far it is set as such.

My code is:

string = str(integer)

x = 0
largest = 0
stringlength = len(string)

while x < stringlength:
    a = int(string[x])
    b = int(string[x+1])
    c = int(string[x+2])
    d = int(string[x+3])
    e = int(string[x+4])
    if (a*b*c*d*e > largest):
        largest = a*b*c*d*e
        print(largest)
    x += 1

print(largest)

I excluded the integer value itself, but for reference it is 1000 digits long. Whenever I try to run this code I get "IndexError: string index out of range". Can anyone help?

Answer 1

string = str(integer)

x = 0
largest = 0
stringlength = len(string)

while x < stringlength-4: # going to -5 would be out of rangue
    a = int(string[x])
    b = int(string[x+1])
    c = int(string[x+2])
    d = int(string[x+3])
    e = int(string[x+4])
    if (a*b*c*d*e > largest):
        largest = a*b*c*d*e
        print(largest)
    x += 1

print(largest)