确实挺不错的

s = input()
alphabet = ['A','B','C','D','a','b','c','d']
list = [0] * 4
dic={'A':0,'B':1,'C':2,'D':3,'a':0,'b':1,'c':2,'d':3}
for i in s:
    if i in alphabet:
        list[dic[i]] += 1
    elif i == '#':
        break
for i in range(len(list)):
    m = max(list)
    for j in range(len(list)):
        if list[j] == m:
            print(chr(j + 65) + ' : ' + str(list[j]))
            list[j] = -1
            break