s,t = input().split(); n,m = len(s),len(t)
dp = [1]+[0]*m; o = 998244353
a = [[] for _ in range(26)]
for i,v in enumerate(t): a[ord(v)-97].append(i)
for i in range(26): a[i].reverse()
for v in s:
    i = ord(v)-97
    for j in a[i]: dp[j+1] = (dp[j+1]+dp[j])%o
print(pow(2,n-m,o)*dp[m]%o)