import sys
input = lambda: sys.stdin.readline().rstrip()
from collections import defaultdict as dd

N=input()
cnt=dd(int)

for a in N:
    cnt[1]+=1
    cnt[ord(a)-63]+=1

ans=[]
maxval=0
for i in range(1,8):
    if cnt[i]==maxval:
        ans.append(i)
    elif cnt[i]>maxval:
        ans.clear()
        ans.append(i)
        maxval=cnt[i]

print(*ans)