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

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

int main()
{
    char t[101],s1[]=" .,?!-:;";
    long long l=0,c=0;

    in.getline(t,101);
    for(long long i=0;i<strlen(t);i++)
        if(strchr(s1,t[i]))
            l++;
    l=strlen(t)-l;


    char *p=strtok(t,s1);
    while(p)
    {
        c++;
        p=strtok(NULL,s1);
    }
    out<<l/c;


    return 0;
}