def check_2x7(a)
	cnt = (0..4).map { a.count(_1) }
	cnt == [3, 0, 7, 0, 0]
end

def check_3x4(a)
	flag = true
	(0...10).each do |i|
		a[i] -= 3 if a[i] >= 3
		if a[i] > 0
			minus = a[i]
			(i...i + 3).each do |j|
				if j < 10
					if minus > a[j]
						flag = false
						break
					end
					a[j] -= minus
				else
					flag = false
				end
			end
		end
	end
	flag
end

def check(a)
	flag = false
	flag = true if check_2x7(a.dup)
	(0...10).each do |i|
		if a[i] >= 2
			a[i] -= 2
			flag = true if check_3x4(a.dup)
			a[i] += 2
		end
	end
	flag
end

s = gets.chomp.chars.map(&:to_i)
a = (0...10).map { s.count(_1) }
puts (0...10).select { |i|
		if i >= 1 && a[i] <= 3
			a[i] += 1
			res = check(a.dup)
			# p [a, res]
			a[i] -= 1
			res
		else
			false
		end
     }