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def get_input(cast, text=''):
    """Request user for input and tries to cast input to cast function provided
    Args:
        cast (function): cast function to use
        text (string): text to print so user can know what to type in!
    Returns:
        casted user input
    """
    try:
        return cast(input(text))
    except:
        return get_input(cast)


def fib(total_fibos=0, fibos=None):
    """Returns an array with `total_fibos` elements of the Fibonacci sequence!
    Args:
        total_fibos (int): number of elements to compute
        fibos (array): array of elements previously computed (for recursive purposes)
    Returns:
        array of integers with `total_fibos` of the Fibonacci sequence.
    """
    fibos = fibos or []

    fibos_count = len(fibos)
    if total_fibos is 0:
        return fibos

    if fibos_count in [0, 1]:
        next_item = fibos_count
    else:
        next_item = fibos[fibos_count-2] + fibos[fibos_count-1]
    fibos.append(next_item)
    return fib(total_fibos-1, fibos)

if __name__ == '__main__':
    total_fibos = get_input(int, 'How many elements of fibonacci\'s series do you want?: ')
    fibos = fib(total_fibos)
    # convert array of integers to string and join them with a space
    print(' '.join([str(fibo) for fibo in fibos]))