#include <iostream>
#include <vector>
#include <string>
#include <cmath>
#include <algorithm>
#include <utility>
#include <queue>
#include <set>
#include <map>

using namespace std;
typedef  long long ll;
typedef pair<int,int> PII;
typedef vector<int> VI;
typedef vector<VI> VVI;
#define  MP make_pair
#define  PB push_back
#define inf  1000000007

ll mod = inf;
bool ok[6000][6000];
ll dp[5010];

int main(){
	string s;
	cin >> s;
	int n = (int)s.size();
	if(n%2==0){
		s.insert(s.begin()+n/2,'-');
		n++;
	}
	int m = (n-1)/2;
	for(int i=0;i<m;i++){
		for(int j=0;j<m;j++){
			if(j+i>m)break;
			if(i==0){
				if(s[j]==s[n-1-j]){
					ok[j][j] = 1;
				}
			}else{
				bool flag = 1;
				for(int k=0;k<=i;k++){
					if(s[j+k]!=s[n-j-1-i+k]){
						flag = 0;
						break;
					}
				}
				if(flag){
					ok[j][j+i] = 1;
				}
			}
		}
	}
	dp[m] = 1;
	for(int i=m-1;i>=0;i--){
		dp[i] = 1;
		for(int j=i;j<=m-1;j++){
			if(ok[i][j]==1){
				dp[i] = (dp[i]+dp[j+1])%mod;
			}
		}
	}
	cout << dp[0] << endl;
	return 0;
}