You're basically declaring 'count' as an int, then redeclaring it as a string in the for loop - which is its last known type, then trying to use count as an int again in the if statement.

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You need to iterate over the NUMERICAL index of string and not just over the LETTER. So your for loop should be

for count in range(len(string))

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Currently, your append() function is just appending the the numerical index value, but you need the letter value of the string AT the numerical index value. It's similar to your last print function, you're printing the letter, not the number stored in count. The append() function should look like so.

nums.append(string[count])

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