def primera_vocal(text):
    for car in text:
        if car in 'aeiou':
            return car
        
def voc_x_dig(text):
    lres = []
    ll = text.split('. ')
    for frase in ll:
        primera = primera_vocal(frase)
        n = frase.count(primera)
        nova_frase = frase.replace(primera,str(n))
        lres.append(nova_frase)
    return '. '.join(lres)