#include <bits/stdc++.h>
#define pb push_back
#define mp make_pair
#define INF 120000000
#define MOD 1000000007

using namespace std;

typedef pair<int, int> P;
typedef long long int LL;

int main() {
    string s;
    cin >> s;
    int n = s.size();

    vector<string> t;
    string f = "", b = "";
    int l = 0, r = n - 1;
    while (l < r) {
        f += s[l]; b = s[r] + b;
        l++; r--;
        if (f == b) {
            t.pb(f);
            f = "";
            b = "";
        }
    }

    // for (int i = 0; i < t.size(); i++) {
    //     cout << t[i] << endl;
    // }

    LL ans = 0;
    LL cnt = 0;
    for (int i = t.size() - 1; i >= 0; i--) {
        ans++;
        if (t[i].size() == 1 && i != 0 && t[i - 1] == t[i]) {
            ans *= 2;
            ans %= MOD;
        }
    }

    ans++;

    cout << ans << endl;

    return 0;
}