import java.util.*;

class Main {
    static final long MOD=1000000007;
    static final long P=1000000009;
    static final long[]Q={MOD,P};
    static long[]dp;
    static long[][]h,p;
    static final long b=31;
    static long c(int x,int y,int j){
        long t=h[j][y];
        t+=h[j][x]*(Q[j]-p[j][y-x])%Q[j];
        return t%Q[j];
    }
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String s=scan.next();
        int n=s.length();
        int[]a=new int[n];
        for(int i=0;i<n;++i)a[i]=s.charAt(i)-'a';
        h=new long[2][n+1];
        p=new long[2][n+1];
        for(int j=0;j<2;++j)
            for(int i=0;i<n;++i)
                h[j][i+1]=(b*h[j][i]+a[i])%Q[j];
        p[0][0]=p[1][0]=1;
        for(int j=0;j<2;++j)
            for(int i=0;i<n;++i)
                p[j][i+1]=p[j][i]*b%Q[j];
        dp=new long[n+1];
        dp[0]=1;
        for(int i=1;i<=n/2;++i){
            long t=0;
            for(int j=0;j<=i;++j){
                if(c(j,i,0)==c(n-i,n-j,0)&&c(j,i,1)==c(n-i,n-j,1))t=(t+dp[j])%MOD;
            }
            dp[i]=t;
        }
        long t=0;
        for(int i=0;i<=n/2;++i)
            t=(t+dp[i])%P;
        //System.err.println(Arrays.toString(dp));
        System.out.println(t);
    }
}