#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;

int x,i,numarlit;
char simbol[100];

int main()
{
    ifstream in("text.in");
    ofstream out("text.out");
    string nrcuv[50];
    while (in >> simbol[x]){
        x++;
    }
    for (i=0;i<=x;i++)
        if (simbol[i]>='a' && simbol[i]<='z' || simbol[i]>='A' && simbol[i]<='Z')
            numarlit++;
    in.clear();
    in.seekg(0, ios::beg);

    x=0;
    while (in >> nrcuv[x]){
        x++;
    }
    out << numarlit/x;
}