s=input()
a=[0]*26
for i in s:
    if "A"<=i<="Z":
        a[ord(i)-ord("A")]+=1
    elif "a"<=i<="z":
        n=ord(i)-ord("a")
        a[n]=a[n]+1
imax=a[0]
for i in range(1,26):
    if imax<a[i]:
        imax=a[i]
s1="";s2=""
for i in range(len(a)):
    if imax==a[i]:
        s1=s1+" "+chr(ord("A")+i)
    elif a[i]==0:
        s2=s2+" "+chr(ord("A")+i)
print(s1[1:])
print(imax)
print(s2[1:])

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 = " ")

s=input()
a=[0]*26
for i in s:
    if "A"<=i<="Z":
        a[ord(i)-ord("A")]+=1
    elif "a"<=i<="z":
        n=ord(i)-ord("a")
        a[n]=a[n]+1
#找到出现次数最多的字母和未出现的字母
maxn=0;maxi=0;no=[]
for i in range(26):
    if a[i]==0:
        no.append(chr(ord("A")+i))
    elif a[i]>maxn:
        maxn=a[i]
        maxi=i

for i in range(26):
    if a[i]==maxn:
        print(chr(ord("A")+i),end=' ')
print()
print(maxn)
for i in no:
    print(i,end=' ')
#Saying and doing are two different things.