#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;

char s[1200000];

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

int main()
{
    int i,nrcuv,nr;
    nrcuv = nr = 0;
    fin.getline(s, 1200000);
    for(i=0; s[i]; i++)
        if((s[i] >='a' && s[i] <= 'z') || (s[i] >='A' && s[i] <= 'Z'))
        {
            nrcuv++;
            while((s[i] >='a' && s[i] <= 'z') || (s[i] >='A' && s[i] <= 'Z'))
            {
                nr++;
                i++;
            }
        }

    fout << nr/nrcuv << "\n";
    return 0;
}