#include <bits/stdc++.h>
#define MOD 1000000007LL
using namespace std;
typedef long long ll;
typedef pair<int,int> P;

ll dp[10001];
ll Bp[10001];
ll hash2[10001];
ll B=103;

int main(void){
	int n;
	string str;
	cin >> str;
	n=str.size();
	Bp[0]=1;
	for(int i=0;i<n;i++){
		hash2[i+1]=hash2[i]*B%MOD;
		hash2[i+1]+=(ll)(str[i]-'a');
		hash2[i+1]%=MOD;
		Bp[i+1]=Bp[i]*B%MOD;
	}

	memset(dp,0,sizeof(dp));
	dp[0]=1;
	ll ans=0;
	for(int i=0;i<n;i++){
		if(dp[i]>0LL){
			ans=(ans+dp[i])%MOD;
			int rest=n-i*2;
			for(int len=0;len<rest/2;len++){
				ll ah=(hash2[i+len+1]-hash2[i]*Bp[len+1]%MOD+MOD)%MOD;
				ll bh=(hash2[n-i]-hash2[n-i-len-1]*Bp[len+1]%MOD+MOD)%MOD;
				if(ah==bh){
					dp[i+len+1]+=dp[i];
					dp[i+len+1]%=MOD;
				}
			}
		}
	}
	printf("%lld\n",ans);
	return 0;
}