def autocomplete(i, d):
    p = 'qwertyuiopasdfghjklzxcvbnm'
    t = ''.join([x for x in i if x.lower() in p])
    q = [
    w for w in d
    if t in w[:len(t)].lower()
    ]
    if len(q)<=5:
        return q
    else:
        return q[:5]


    print(autocomplete('a3i',[ 'abnormal', 'arm-wrestling', 'absolute',
    'airplane', 'airport', 'amazing', 'apple', 'ball' ]))

q = [w for w in d if t in w[:len(t)].lower() and len(q)< 5]

def autocomplete(i, d, threshold=5):
    p = 'qwertyuiopasdfghjklzxcvbnm'
    t = ''.join([x for x in i if x.casefold() in p])
    return [w for cnt,w in enumerate(d)
            if w.startswith(t.casefold()) and cnt < threshold]