#include<cstdio>
#include<iostream>
#include<algorithm>
#include<string>
#include<queue>
#include<vector>
#include<functional>
#include<cmath>
#include<map>
#include<stack>
#include<set>
#include<numeric>
#include<limits>

#define all(x) (x).begin(),(x).end()
#define rall(x) (x).rbegin(),(x).rend()

using namespace std;
typedef long long ll;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef pair<ll, string> pls;

int main()
{
	string s;  cin >> s;

	int ans = 1;
	for (int i = 0; i < s.size(); i++) {
		for (int j = i + 1; j < s.size(); j++) {
			if (s[i] != s[j])ans++;
		}
	}
	cout << ans << endl;
	return	0;
}