#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int main()
{
    int i,n,nr=0,nr1=0;
    char s[1000001];
    f.getline(s,1000001);
    n=strlen(s);
    s[n]=' ';
    s[n+1]=NULL;
    for(i=0;i<strlen(s);i++)
    {
        if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z')||(s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
        nr++;
        if(s[i]==' '||s[i]=='!'||s[i]=='-')
           if(((s[i-1]>='a'&&s[i-1]<='z')||(s[i-1]>='A'&&s[i-1]<='Z'))||(s[i+1]>='a'&&s[i+1]<='z')||(s[i+1]>='A'&&s[i+1]<='Z'))
            nr1++;
    }
    g<<nr/nr1;
    return 0;
}