import math
 
while True:
    try:
        number = float(input("Enter a number: "))
        if number < 0:
            print("Error: Cannot calculate the square root of a negative number.")
        else:
            square_root = math.sqrt(number)
            print("The square root of", number, "is", square_root)
            break  # Exit the loop if successful
    except ValueError:
        print("Error: Invalid input. Please enter a valid number.")

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Nw==

7