The Fibonacci Sequence is a series of numbers. The next number is found by adding up the two numbers before it. For example, 0, 1, 1, 2, 3, 5, 8, 13, 21. The next number in this series is 13+21 = 34. Write a program that will take as user input any two consecutive numbers between 0 and 21 in the Fibonacci sequence, e.g. 1 1 or 8 13. The next number in the sequence should be stored in a variable called next. After that print next

def fibonacci(a, b):
    return a + b

fibonacci(13, 21)