#include<fstream>
#include<string.h>

using namespace std;

#define M 505
#define MOD 666013
#define lit 30

ifstream f("subsir.in");
ofstream g("subsir.out");

int n, m, c[M][M], d[M][M], ia[M][lit], ib[M][lit];

char a[M], b[M];

int maxim(int x, int y)
{
    if(x>y) return x;
    else return y;
}

int main()
{
    f >>a>>b;
    n = strlen(a);
    m = strlen(b);
    a[n++] = '0';
    b[m++] = '0';
    for(int i = 0; i < n; i++)
    {
        for(int j = 0; j < lit; j++)
            ia[i][j] = ia[i - 1][j];
        ia[i][a[i] - 'a'] = i;
    }

    for(int i = 0; i < m; i++)
    {
        for(int j = 0; j < lit; j++)
            ib[i][j] = ib[i - 1][j];
        ib[i][b[i] - 'a'] = i;
    }

    for(int i = 0; i <  n; i++)
        for(int j = 0; j < m; j++)
            if(a[i] == b[j])
                c[i][j] = c[i - 1][j - 1] + 1;
            else
                c[i][j] = maxim(c[i - 1][j], c[i][j - 1]);

    d[0][0] = 1;
    for(int i = 0; i < n; i++)
        for(int j = 0; j < m; j++)
        {
            if(c[i][j] == 1)
            {
                d[i][j] = 1;
            }
            for(int k = 0 ;k < lit; k++)
            {
                int ii = ia[i - 1][k];
                int jj = ib[j - 1][k];
                if(c[i][j] == c[ii][jj] + 1)
                {
                    d[i][j] += d[ii][jj];
                    d[i][j] %= MOD;
                }
            }
        }
    g << d[n][m];
    return 0;
}