#include <bits/stdc++.h>
using namespace std;
#define dim 505
#define mod 3210121
ifstream fin("iv.in");
ofstream fout("iv.out");
int d[dim][dim][dim],sts,stj,drs,drj,l,i,j,n,m,sol;
char s1[dim],s2[dim];

int main()
{
  fin>>(s1+1)>>(s2+1);
  n=strlen(s1+1);
  m=strlen(s2+1);
  if(s1[1]==s1[n])
    d[1][1][1]=1;
  if(s2[1]==s2[m])
    d[1][0][0]=1;
  if(s1[1]==s2[m])
    d[1][1][0]=1;
  if(s2[1]==s1[n])
    d[1][0][1]=1;
   for(l=2;l<=(n+m)/2;l++){
        for(i=0;i<=n && i<=l;i++)
            for(j=0;i+j<=n && j<=l;j++){

                if(s1[i]==s1[n-j+1] && i>0 && n-j+1<=n){
                    d[l][i][j]+=d[l-1][i-1][j-1];
                    d[l][i][j]%=mod;
                }


                if(s1[i]==s2[m-l+j+1] && i>0 && m-l+j+1<=m){
                    d[l][i][j]+=d[l-1][i-1][j];
                     d[l][i][j]%=mod;
                }

                if(s2[l-i]==s1[n-j+1] && l-i>0 && n-j+1<=n){
                    d[l][i][j]+=d[l-1][i][j-1];
                     d[l][i][j]%=mod;
                }

                if(s2[l-i]==s2[m-l+j+1] && l-i>0 && m-l+j+1<=m){
                    d[l][i][j]+=d[l-1][i][j];
                     d[l][i][j]%=mod;
                }

    }
  }

  if ((n+m)%2==0)
        for (i=0;i<=n;i++){
            sol+=d[l-1][i][n-i];
            sol%=mod;
        }
    else
        for (i=0;i<n;i++){
            sol+=d[l-1][i][n-i-1];
            sol%=mod;
            sol+=d[l-1][i][n-1];
            sol%=mod;
        }

    fout<<sol;
}