func main()
	var a: []char :: cui@input()
	do a.reverse()
	
	var v: int :: 0
	var nums: []int :: #[8]int
	for i(0, ^a - 1)
		do v :* 16
		do v :+ a[i] $ int - 'A' $ int + 10
		if(i % 4 = 3 | i = ^a - 1)
			while(v <> 0)
				do nums[v % 8] :+ 1
				do v :/ 8
			end while
			do v :: 0
		end if
	end for
	
	var max: int :: nums.max()
	var ans: []int :: #[0]int
	for i(0, 7)
		if(nums[i] = max)
			do ans :~ [i]
		end if
	end for
	do cui@print("\{ans.join(" ")}\n")
end func