Question: Language: Python - A lucky number is a number that contains either 7s or 9s in its digits but not both. For example 17, 39,

Language: Python - A lucky number is a number that contains either 7s or 9s in its digits but not both. For example 17, 39, 777 are lucky numbers. 234, 697 are not.

The solution cannot iterate through the range of numbers one at a time. Needs to work with really large number Ex: range (345678, 98765432)

Task: Print the number of lucky numbers between L and H inclusive, L < H

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