#include<bits/stdc++.h>
using namespace std;
const int mod=998244353,base=13331,m1=1e9+7,m2=1e9+9;
typedef long long ll;
inline int read(){
    int x=0;bool f=1;char ch=getchar();
    while(ch<'0'||ch>'9'){if(ch=='-')f=0;ch=getchar();}
    while(ch>='0'&&ch<='9'){x=(x<<1)+(x<<3)+ch-'0';ch=getchar();}
    if(f)return x;
    return ~(x-1);
}
char s[1000005],t[1000005];
int n,m;
struct h{
	int mod;
	ll h1[1000005],h2[1000005],pw[1000005];
	void build(int x){
		mod=x;
		pw[0]=1;
		for(int i=1;i<=1e6;i++)pw[i]=pw[i-1]*base%mod;
		for(int i=1;i<=n;i++){
			h1[i]=(h1[i-1]*base+s[i])%mod;
		}
		for(int i=1;i<=m;i++){
			h2[i]=(h2[i-1]*base+t[i])%mod;
		}
	}
	bool cmp(int l1,int r1,int l2,int r2){
		assert(r1-l1+1==r2-l2+1);
		return ((h2[r2]-h2[l2-1]*pw[r2-l2+1]%mod+mod)%mod)==((h1[r1]-h1[l1-1]*pw[r1-l1+1]%mod+mod)%mod);
	}
}c1,c2;
bool cmp(int l1,int r1,int l2,int r2){
	return c1.cmp(l1,r1,l2,r2)&&c2.cmp(l1,r1,l2,r2);
}
struct bit{
	ll c[1000005];
	inline void add(int x,ll y){
		for(;x<=n;x+=x&-x)(c[x]+=y)%=mod;
	}
	inline ll ask(int x){
		ll res=0;
		for(;x;x-=x&-x)res+=c[x];
		return res%mod;
	}
	inline void add(int l,int r,ll v){
		add(l,v),add(r+1,-v);
	}
}t0,t1,t2;
int main(){
	scanf("%s",s+1),scanf("%s",t+1);
	n=strlen(s+1),m=strlen(t+1);
	c1.build(m1),c2.build(m2);
	for(int i=0;i<n;i++){
		int R=0;
		int l=1,r=min(n-i,m),res=0;
		while(l<=r){
			int mid=l+r>>1;
			if(cmp(i+1,i+mid,1,mid))l=mid+1,res=mid;
			else r=mid-1;
		}
		R=res;
		if(R<min(n-i,m)){
			++R;
			l=1,r=min(n-R-i,m-R),res=0;
			while(l<=r){
				int mid=l+r>>1;
				if(cmp(i+R+1,i+R+mid,R+1,R+mid))l=mid+1,res=mid;
				else r=mid-1;
			}
			R+=res;
			R=min(R,m);
		}
		
		R+=i;
		assert(R-i<=m);
		int c0=t0.ask(i),c1=t1.ask(i),c2=t2.ask(i);
		if(i==0)c0=1;
		t0.add(i+1,R,c0),t1.add(i+1,R,c1+c0),t2.add(i+1,R,(c2+2*c1+c0)%mod);
	}
	cout<<t2.ask(n);
}