#include <iostream>
#include <fstream>

using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");

long long n, i, j, c, t;
string s;

int main () {
    
    getline(fin, s);
    s[s.size()]=' ';
    
    for (i = 0; i <= s.size(); i++)
    {
        if ((s[i] >= 65 && s[i] <= 90) || (s[i] >= 97 && s[i] <= 122)) t++;
        
        if ((s[i] < 65 || (s[i] > 90 && s[i] < 97) || s[i] > 122) && ((s[i-1] >= 65 && s[i-1] <= 90) || (s[i-1] >= 97 && s[i-1] <= 122)))
            c++;
    }
    
    fout << t / c << "\n";
}