#include <cstdio>
#include <iostream>
#include <string>
#include <sstream>
#include <stack>
#include <algorithm>
#include <cmath>
#include <queue>
#include <map>
#include <set>
#include <cstdlib>
#include <bitset>
#include <tuple>
#include <assert.h>
#include <deque>
#include <bitset>
#include <iomanip>
#include <limits>
#include <chrono>
#include <random>
#include <array>
#include <unordered_map>
#include <functional>
#include <complex>
#include <numeric>
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
constexpr long long MAX = 5100000;
constexpr long long INF = 1LL << 60;
constexpr int inf = 1000000007;
constexpr long long mod = 1000000007LL;
//constexpr long long mod = 998244353LL;
const long double PI = acos((long double)(-1));

using namespace std;
typedef unsigned long long ull;
typedef long long ll;
typedef long double ld;

struct mint {
	long long x;
	mint(long long x = 0) :x((x% mod + mod) % mod) {}
	mint& operator+=(const mint a) {
		if ((x += a.x) >= mod) x -= mod;
		return *this;
	}
	mint& operator-=(const mint a) {
		if ((x += mod - a.x) >= mod) x -= mod;
		return *this;
	}
	mint& operator*=(const mint a) {
		(x *= a.x) %= mod;
		return *this;
	}
	mint operator+(const mint a) const {
		mint res(*this);
		return res += a;
	}
	mint operator-(const mint a) const {
		mint res(*this);
		return res -= a;
	}
	mint operator*(const mint a) const {
		mint res(*this);
		return res *= a;
	}
	mint pow(ll t) const {
		if (!t) return 1;
		mint a = pow(t >> 1);
		a *= a;
		if (t & 1) a *= *this;
		return a;
	}

	// for prime mod
	mint inv() const {
		return pow(mod - 2);
	}
	mint& operator/=(const mint a) {
		return (*this) *= a.inv();
	}
	mint operator/(const mint a) const {
		mint res(*this);
		return res /= a;
	}
};

mint COM[1001][1001] = {};

void COMinit(void) {
	for (ll i = 0; i <= 1000; i++) {
		for (ll j = 0; j <= i; j++) {
			if (j == 0 || j == i) {
				COM[i][j] = 1LL;
			}
			else {
				COM[i][j] = COM[i - 1][j - 1] + COM[i - 1][j];
			}
		}
	}
}


vector<pair<char, ll>> RLE(string& s) {
	ll cnt = 0;
	vector<pair<char, ll>> res;
	for (ll i = 0; i < s.size(); i++) {
		cnt++;
		if (i == (ll)s.size() - 1) {
			res.push_back(make_pair(s[i], cnt));
			break;
		}
		if (s[i] != s[i + 1]) {
			res.push_back(make_pair(s[i], cnt));
			cnt = 0;
		}
	}
	return res;
}
int main()
{
    /*
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    */
	COMinit();
	string s; cin >> s;
	sort(s.begin(), s.end());
	auto vp = RLE(s);
	int n = s.size();
	mint res = 1;
	for (auto p : vp) {
		res *= COM[n][p.second];
		n -= p.second;
	}
	res -=1;
	cout << res.x << "\n";
    return 0;
}