#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int maxn=1e6+5;
const int mod=2000223479;
const int p=998244353;
char s[maxn],t[maxn];
int n,m;
ll sum1[maxn],sum2[maxn],qp[maxn];
void Init() {
	int N=max(n,m);
	qp[0]=1;
	for(int i=1;i<=N;++i) qp[i]=qp[i-1]*1373%mod;
	for(int i=1;i<=n;++i) sum1[i]=(sum1[i-1]*1373+(s[i]-'a'+1))%mod;
	for(int i=1;i<=m;++i) sum2[i]=(sum2[i-1]*1373+(t[i]-'a'+1))%mod;
}
inline ll query1(int l,int r) {
	return (sum1[r]-sum1[l-1]*qp[r-l+1]%mod+mod)%mod;
}
inline ll query2(int l,int r) {
	return (sum2[r]-sum2[l-1]*qp[r-l+1]%mod+mod)%mod;
}
int dp2[maxn],dp1[maxn],dp0[maxn];
int lazy2[maxn<<2],lazy1[maxn<<2],lazy0[maxn<<2];
inline void add(int &x,int y) {
	x+=y;
	if(x>=p) x-=p;
}
void update(int rt,int l,int r,int L,int R,int p) {
	if(L<=l&&R>=r) {
		int res=dp0[p];
		add(lazy0[rt],res);
		add(res,dp1[p]),add(lazy1[rt],res);
		add(res,dp1[p]),add(res,dp2[p]),add(lazy2[rt],res);
		return;
	}
	int mid=l+r>>1;
	if(L<=mid) update(rt<<1,l,mid,L,R,p);
	if(R>mid) update(rt<<1|1,mid+1,r,L,R,p);
}
void query(int rt,int l,int r,int p) {
	add(dp0[p],lazy0[rt]);
	add(dp1[p],lazy1[rt]);
	add(dp2[p],lazy2[rt]);
	if(l==r) return;
	int mid=l+r>>1;
	if(p<=mid) query(rt<<1,l,mid,p);
	else query(rt<<1|1,mid+1,r,p);
}
void solve(int rt,int l,int r,int p) {
	if(l==r) {
		lazy0[rt]=1;
		return;
	}
	int mid=l+r>>1;
	solve(rt<<1,l,mid,p);
}
int main() {
	scanf("%s%s",s+1,t+1);
	n=strlen(s+1),m=strlen(t+1);
	Init();
	solve(1,0,n,0);
	for(int i=1;i<=n;++i) {
		dp0[i-1]=dp1[i-1]=dp2[i-1]=0;
		query(1,0,n,i-1);
		int now=1;
		int p=i;
		int l=i,r=min(n,i+m-1);
		while(l<=r) {
			int mid=l+r>>1;
			//printf("%d-%d %d-%d\n",p,mid,now,now+mid-p);
			if(query1(p,mid)==query2(now,now+mid-p)) l=mid+1;
			else r=mid-1;
		}
		if(l>n||l-i+1>m) l--;
		if(l<n&&l-i+1<m) {
			p=l+1,now=p-i+1;
			l=p,r=min(n,i+m-1);
			while(l<=r) {
				int mid=l+r>>1;
				if(query1(p,mid)==query2(now,now+mid-p)) l=mid+1;
				else r=mid-1;
			}
			l--;
		}
		update(1,0,n,i,l,i-1);
	}
	dp0[n]=dp1[n]=dp2[n]=0;
	query(1,0,n,n);
	printf("%lld\n",dp2[n]);
	return 0;
}
/*
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*/