## https://yukicoder.me/problems/no/2942


MOD = 998244353



def main():
    S, T = input().split()

    dp = [0] * (len(T) + 1)
    dp[0] = 1

    for s in S:
        new_dp = dp.copy()
        for t in range(len(T)):
            if s == T[t]:
                new_dp[t + 1] += dp[t]
                new_dp[t + 1] %= MOD
        dp = new_dp
    
    ans = dp[len(T)]

    ans *= pow(2, len(S) - len(T), MOD)
    ans %= MOD
    print(ans)










if __name__ == "__main__":
    main()