S = input()
MOD = 998244353
dp = [[0]*3 for _ in range(len(S)+1)]
p = 1
for i in range(len(S)):
    if S[i] == '0':
        dp[i+1][0] = ( dp[i][0] + p ) % MOD
        dp[i+1][1] = dp[i][1]
        dp[i+1][2] = ( dp[i][2] + dp[i][1] ) % MOD
    elif S[i] == '1':
        dp[i+1][0] = dp[i][0]
        dp[i+1][1] = ( dp[i][1] + dp[i][0] ) % MOD
        dp[i+1][2] = dp[i][2]
    elif S[i] == '?':
        dp[i+1][0] = ( 2 * dp[i][0] + p ) % MOD
        dp[i+1][1] = ( 2 * dp[i][1] + dp[i][0] ) % MOD
        dp[i+1][2] = ( 2 * dp[i][2] + dp[i][1] ) % MOD
        p *= 2
print( dp[len(S)][2] )