#include <iostream>
#include <string>
#include <vector>
using namespace std;

#include <atcoder/modint>
using mint = atcoder::modint998244353;

constexpr int md = mint::mod();

int main() {
    cin.tie(nullptr), ios::sync_with_stdio(false);

    string S, T;
    cin >> S >> T;

    const int n = T.size();

    vector<int> dp(n + 1);
    dp[0] = 1;
    for (auto c : S) {
        for (int i = n - 1; i >= 0; --i) {
            if (T[i] == c) {
                dp[i + 1] += dp[i];
                if (dp[i + 1] >= md) dp[i + 1] -= md;
            }
        }
    }

    cout << (mint(2).pow(S.size() - T.size()) * dp.back()).val() << '\n';
}