# Welcome. In this kata, you are asked to square every digit of a number and concatenate them.
# For example, if we run 9119 through the function, 811181 will come out, because 92 is 81 and 12 is 1. Note: The function accepts an integer and returns an integer

def square_digits(num):
    output = ''
    num_string = str(num)
    for i in num_string:
        output = output + str((int(i))**2)
    print(int(output))
    return int(output)

square_digits(9119)
square_digits(8214)
square_digits(9)

# another way
