s, t = input().split()
mod = 998244353
dp = [0]*(len(t) + 1)
dp[0] = 1
for i in range(len(s)):
    for j in range(len(t), 0, -1):
        if s[i] == t[j-1]:
            dp[j] += dp[j-1]
            dp[j] %= mod

print(dp[-1]*pow(2, len(s)-len(t), mod)%mod)