#include <iostream>
#include <fstream>
using namespace std;

int e_litera(char a)
{
    if((a>=65 && a<=90) || (a>=97 && a<=122) )
        return 1;

        return 0;
}
int main()
{
    int nrcuvinte=0;
    int nrlitere=0;
    ifstream cin("text.in");
    char c;
    char lastChar=0;
    while(cin>>noskipws>>c)
    {

        if(e_litera(c))  nrlitere++;

        if(lastChar!=0)
        {
            if(!e_litera(c) && e_litera(lastChar))
                nrcuvinte++;
        }
        lastChar=c;


    }
    ofstream cout("text.out");
    cout<<nrlitere/nrcuvinte;


    return 0;
}