S, T = input().split()

MOD = 998244353
dp = [[0]*(len(T)+1) for _ in range(len(S)+1)]
dp[0][0] = 1
for i in range(len(S)):
    for j in range(len(T)+1):
        dp[i+1][j] += dp[i][j]
        dp[i+1][j] %= MOD
        if j < len(T) and S[i] == T[j]:
            dp[i+1][j+1] += dp[i][j]
            dp[i+1][j+1] %= MOD

ans = dp[-1][-1]
for _ in range(len(S)-len(T)):
    ans *= 2
    ans %= MOD

print(ans)