// #pragma GCC optimize ("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target ("avx,avx2,fma")
#include <bits/stdc++.h>

using std::cin, std::cout, std::cerr;
using ll = long long;

const ll P = 1e9 + 7;
ll Pow(ll a, ll b) {
    ll r = 1;
    for(; b; b /= 2) {
        if(b & 1)
            r = r * a % P;
        a = a * a % P;
    }
    return r;
}

int main() {
    std::ios::sync_with_stdio(false);
    std::string s; cin >> s;

    auto upd = [](ll &a, ll b) {
        a += b;
        a %= P;
    };
    std::vector<ll> f(128);
    ll ans = 0;
    int n = s.size();
    for(int i = 0; i < n; i ++) {
        char c = s[i];
        std::vector<ll> g(128, 0);
        upd(g[c], 1);
        upd(ans, Pow(2, n - i - 1));
        for(char t = 'a'; t <= 'z'; t ++) {
            if(t != c) {
                upd(g[t], f[t]);
                upd(ans, f[t] * Pow(2, n - i - 1));
                upd(g[c], f[t]);
            } else {
                upd(g[t], 2 * f[t]);
            }
        }
        // cout << "------\n";
        // cout << g['a'] << ' ' << g['b'] << ' ' << ans << '\n';
        f = g;
    }
    cout << ans << '\n';
}