STEP 8: A sneakily important part of our game is going to be uppercase and lowercase letters!

.upper() and .lower() change all letters in a string to uppercase or lowercase!

• Find the line of code you just added in the last activity with stage.ask().
• Add .lower() to the end of that code, like this: stage.ask("Guess a letter!", 0, -200).lower()
• Storing a lowercase letter in letter_guess is important because we will check to see that it's in the word!

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