#include <iostream>
#include <cstring>
#include <fstream>

using namespace std;

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

int main()
{
    char sir[101];
    fin.getline(sir, 101);
    int n=strlen(sir);
    int cnt1=0, cnt2=0;
    for(int i=1;i<=n;i++)
        if((sir[i]>='a' && sir[i]<='z')||(sir[i]>='A' && sir[i]<='Z'))
            cnt1++;

    char sep[]=" .,!?-";
    char *p=strtok(sir, sep);
    while(p!=NULL)
    {
        cnt2++;
        p=strtok(NULL, sep);
    }
    fout<<cnt1/cnt2;

    fin.close();
    fout.close();
    return 0;
}