#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()]=' ';
    
    bool ok = 0, ok2 = 0;
    for (i = 0; i <= s.size(); i++)
    {
        ok = 0; ok2 = 0;
        if ((s[i] >= 65 && s[i] <= 90) || (s[i] >= 97 && s[i] <= 122))  ok = 1;
        if ((s[i-1] >= 65 && s[i-1] <= 90) || (s[i-1] >= 97 && s[i-1] <= 122))  ok2 = 1;
        
        if (ok == 1) t++;
        
        if (ok == 0 && ok2 == 1)    {   c++;    }
    }
    
    //cout << t << " " << c << "\n";
    if (c != 0) fout << t / c << "\n";
    else fout << 0 << "\n";
}