Duration: 3:05

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EXPLANATION CODE:
1) This is a Python function that takes a string s as an argument and returns the number of times the letters in the string alternate between uppercase and lowercase.

2)Here's how the function works:
It initializes a string key with the value 'word'.
It initializes a variable letter_i with the value 0.
It loops through each character c in the string s.
If the lowercase version of the current character matches the character in key at index letter_i % len(key), the function increments letter_i.
The function returns the integer division of letter_i by the length of key.

Contents:
0:00 - Reading
1:10 - Solving
2:25 - Explaining

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