#yuki1729
import collections
import itertools
n=input()
x=oct(int(n,16))
x=x[2:]
c=collections.Counter(x)
mode_v=c.most_common()[0][-1]
it=itertools.takewhile(lambda kv: kv[-1]==mode_v,c.most_common())
print(*(k for k,v in it))