#include <fstream>
#include <iostream>
#include <string.h>

using namespace std;

int main()
{
    ifstream e("text.in");
    ofstream g("text.out");
    char x[101];
    int nr = 0;
    int c = 0;
    e.get(x,101);
    for (int i = 0; i < strlen(x); i++)
    {
        if (x[i] >= 'A' && x[i] <= 'Z')
            c++;
        if (x[i] >= 'a' && x[i] <= 'z')
            c++;
    }
    e.close();
    ifstream f("text.in");
    f.get(x,101);
    char *p;
    p = strtok(x, " ,.?!;:-'\"/*+-(){}[]");
    while (p)
    {
        nr++;
        p = strtok(NULL, " ,.?!;:-'\"/*+-(){}[]");
    }
    g << c / nr;
    f.close();
    g.close();
    return 0;
}