##
## 1.1: a recursive solution
##
def length_odds(vals):
    if vals == []:
        return 0
    else:
        len_odds_rest = length_odds(vals[1:])
        if len(vals[0]) % 2 == 1:
            return len(vals[0]) + len_odds_rest
        else:
            return len_odds_rest


##
## 1.2: a solution using a list comprehension
##
def length_odds(vals):
    odd_lengths = [len(w) for w in vals if len(w) % 2 == 1]
    return sum(odd_lengths)