#include<stdio.h>
#include<iostream>
#include<vector>
#include<string>
using namespace std;
vector<string> qs;
int tt;
bool book[100010];
int main()
{
    string s, s1;
    getline(cin, s);
    int flag = 0;
    for (int i = 0; i < s.size(); i++)
    {
        if (s[i] != ' ' &&s[i] != ',' &&s[i] != '.')
            s1 += s[i], flag = 1;
        else
        if (flag == 1)
            qs.push_back(s1), flag = 0, s1.erase();
    }
    for (int i = 0; i < qs.size(); i++)
    {
        flag = 0;
        string t = qs[i];book[i] = true;
        for (int j = i + 1; j < qs.size();j++)
        if (qs[j] == t && !book[j])
        {
            flag = 1; book[j] = true;
        }
        if (flag == 1)
            tt++;
    }
    cout << tt << endl;
}