#include <iostream>
#include <fstream>
#include <string>
#include <cstring>
#include <ctype.h>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
int main()
{
    int nrcuv=0,nrlitere=0;
    char c, last = '#';
    while(in.get(c))
    {
        if(isalpha(c)) {
            nrlitere++;
            if(!isalpha(last))
                nrcuv++;
        }
        last = c;
    }
    out<<nrlitere/nrcuv;
    return 0;
}