s = input()
s = s.upper()
dic = {}
for i in s:
    if i == " ":
        continue
    if i in dic:
        dic[i] += 1
    else:
        dic[i] = 1
num = list(dic.values())
no = []
ans = []
for i in range(0,26):
    t = chr(ord("A")+i)
    if t not in dic:
        no.append(t)
    else:
        if dic[t] == max(num):
            ans.append(t)

print("出现次数最多的字母是： ",end = "")
for i in ans:
    print(i,end = " ")
print("出现次数为：",end = "")
print(max(num))
print("未出现的字母是：  ",end = "")
for i in no:
    print(i,end = " ")