Counting the number of letters in a string alphabetically

[Yoriz]

from collections import Counter
import string

test_string = 'Sentence Statistics'

counter = Counter(test_string)

for item, count in counter.most_common():
    if item in string.ascii_letters:
        print(f'{item} appeared {count} times')

Output:
t appeared 4 times
e appeared 3 times
S appeared 2 times
n appeared 2 times
c appeared 2 times
i appeared 2 times
s appeared 2 times
a appeared 1 times