vowels={'v':0}
test="this is a big long sentence......(well, not really :))"
for i in test:
    if i=='a':
        vowels['v'] = vowels['v']+1
    elif i=='e':
        vowels['v'] = vowels['v']+1
    elif i=='i':
        vowels['v'] = vowels['v']+1
    elif i=='o':
        vowels['v'] = vowels['v']+1
    elif i=='u':
        vowels['v'] = vowels['v']+1
print (vowels)
######ok......here's a shorter way of doing it....
mvowels={'v':0}      
for j in test:
    if j in 'aeoiu':
        mvowels['v'] = mvowels['v']+1
print (mvowels)