Write a program which counts and reports the number of each alphabetical letter. Ignore the case of characters.
n = list(input().lower())
charac = []
for j in range(97,97+26):
    m= 0
    for i in range(0,len(n)):
        if ord(n[i]) == j:
            m += 1
        charac.append("{} : {}".format(chr(j),m))

for i in range(0,26):
    print(charac[i])
s =""
while True:
    try:
        s += input().lower()
    except:
        break
    
s = list(map(ord,list(s)))
for i in range(ord("a"),ord("z")+1):
    print(chr(i) + " : " + str(s.count(i)))