#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

string S;
vector<vector<string>> substrings;

long dp[5000];

long find(int now){
    if(now >= (S.size() + 1) / 2){
        return 1;
    }else if(dp[now] != -1){
        return dp[now];
    }else{
        long ans = 0;
        for(int i = 0; i + now < S.size() / 2; i++){
            if(substrings[i][now] == substrings[i][S.size() - i - now - 1]){
                ans += find(i + now + 1);
                ans %= 1000000007;
            }
        }
        return dp[now] = (ans + 1) % 1000000007;
    }
}

int main(){
    cin >> S;
    for(int i = 0; i <= S.size() / 2; i++){
        substrings.push_back({});
    }
    for(int i = 0; i <= S.size() / 2; i++){
        string substring = "";
        for(int j = i; j <= S.size() / 2; j++){
            substring.push_back(S[i]);
            substrings[substring.size() - 1].push_back(substring);
        }
    }
    for(int i = 0; i < 5000; i++){
        dp[i] = -1;
    }
    cout << find(0) << endl;
}