S, T = input().split()

N = len(S)
M = len(T)
c = [[] for i in range(26)]
mod = 998244353

for i in range(M):
    a = ord(T[i]) - ord("a")
    c[a].append(i)
               
dp = [0] * (M+1)
dp[0] = 1

ndp = dp[:]


for i in range(N):
    a = ord(S[i]) - ord("a")

    for x in c[a]:
        ndp[x+1] = (ndp[x+1] + dp[x]) % mod

    dp = ndp[:]

print((dp[-1] * pow(2, N-M, mod)) % mod)