#include <fstream>
#include <cstring>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
int main()
{char c[256];
    in.getline(c,256);
    int i,n,cuv=0,lit=0,medie=0;
    n=strlen(c);
    for(i=0;i<n;i++)
    {
        if(isalpha(c[i]))
            cuv++;
        else
            if(strchr("., !?;-:",c[i])&&isalpha(c[i-1]))
                lit++;
    }
    medie=cuv/lit;
    out<<medie;
    return 0;
}