#include"bits/stdc++.h"

//#include<bits/stdc++.h>
using namespace std;
#define print(x) cout<<x<<endl;
#define rep(i,a,b) for(int i=a;i<b;i++)
typedef long long ll;
const ll mod = 537;

string s;

int main() {
	cin >> s;

	ll count[26] = {};
	ll n= s.size();
	ll c[1005][1005] = {};

	rep(i, 1, 1002) {
		rep(j, 0, i+1) {
			c[i][j] = (j == 0 || j == 1) ? 1 : (c[i - 1][j - 1] + c[i - 1][j]) % mod;
		}
	}

	rep(i, 0, n) {
		count[s[i] - 'A']++;
	}
	
	ll ret = 1;

	rep(i, 0, 26) {
		if (count[i] >= 1) {
			ret = ret*c[n][count[i]] % mod;
			n -= count[i];
		}
	}
	
	print((ret + mod - 1) % mod);
	return 0;
}