MOD = 998244353
S = input()
N = len(S)
if N < 3:
    print(0)
    exit()

def solve():
    dp = [[0] * 4 for _ in range(N + 1)]
    dp[0][0] = 1
    
    for i in range(N):
        tmp = 0
        if S[i] == "0" or S[i] == "?":
            dp[i+1][1] += dp[i][0]
            dp[i+1][3] += dp[i][2]
            tmp += 1
        if S[i] == "1" or S[i] == "?":
            dp[i+1][2] += dp[i][1]
            tmp += 1
        for j in range(4):
            dp[i+1][j] += dp[i][j] * tmp
            dp[i+1][j] %= MOD
        #print(i,dp)
    return dp[N][3]

print(solve())