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

using namespace std;
fstream fin("text.in",ios::in),fout("text.out",ios::out);
char x[1000],*p;
char litere[]="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPRSTUVWXYZ";
int main()
{
    int s=0,nrc=0,n,i;

    fin.getline(x,1000);
    n=strlen(x);
    for(i=0;i<n;i++)
    {
        if(strchr(litere,x[i])!=0)
        {
            s++;
        }
    }
    p=strtok(x," -,!?;.");
    while(p!=0)
    {
        nrc++;
        p=strtok(0," -,!?;.");
    }
    fout<<s/nrc;
    fin.close();
    fout.close();
    return 0;
}