def tongji(s):
    res = {}
    for i in range(26):
        w = ord('A') + i
        w = chr(w)
        res[w] = 0
    for j in s:
        for i in range(26):
            if ord(j) == ord('A') + i:
                res[j] += 1
    return res

s = input()
res = tongji(s)
for i, j in res.items(): 
    print('{}:{}'.format(i,j))