#include <bits/stdc++.h>
using namespace std;

void fast_io() {
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
}

#include <atcoder/modint>
using mint = atcoder::modint998244353;
int main() {
	fast_io();
	string s, t;
	cin >> s >> t;
	int n = s.size(), m = t.size();
	mint dp[m + 1] = {};
	dp[0] = 1;
	for (int i = 0; i < n; i++) {
		for (int j = m - 1; j >= 0; j--) {
			if (s[i] == t[j]) {
				dp[j + 1] += dp[j];
			}
		}
	}
	mint ans = dp[m] * mint(2).pow(n - m);
	cout << ans.val() << endl;
}