S = gets.chomp
N = S.size
MOD = 998_244_353

dp = Array.new(N + 1) { Array.new(4, 0) }
dp[0][0] = 1

N.times do |i|
  s = S[i]

  4.times do |j|
    dp[i + 1][j] = dp[i][j]
  end

  if s == '0'
    dp[i + 1][3] += dp[i][2]
    dp[i + 1][1] += dp[i][0]
  elsif s == '1'
    dp[i + 1][2] += dp[i][1]
  else
    dp[i + 1][3] += dp[i][3] + dp[i][2]
    dp[i + 1][2] += dp[i][2] + dp[i][1]
    dp[i + 1][1] += dp[i][1] + dp[i][0]
    dp[i + 1][0] += dp[i][0]
  end

  4.times do |j|
    dp[i + 1][j] %= MOD
  end
end

puts dp[N][3]