import sys

s=s = sys.stdin.read().lower()

for i in range(97,123):print((chr(i),':',s.count(chr(i))))
import sys

s=sys.stdin.read().lower()

for i in range(97,123):print((chr(i),':',s.count(chr(i))))
import sys

s = s = sys.stdin.read().lower()
for i in range(97, 123):
    print((chr(i), ":", s.count(chr(i))))

import sys

s = sys.stdin.read().lower()
for i in range(97, 123):
    print((chr(i), ":", s.count(chr(i))))

-s = s = sys.stdin.read().lower() +s = sys.stdin.read().lower()