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

using namespace std;

int main()
{
    FILE *in = fopen("text.in", "r");
    FILE *out = fopen("text.out", "w");

    int c, tot = 0, cuv = 0;
    bool isPrevLett = false;
    do
    {
        c = getc(in);
        if (c > 64 && c < 91 || c > 96 && c < 123)
        {
            tot++;
            isPrevLett = true;
        }
        else
        {
            if (isPrevLett)
            {
                cuv++;
                isPrevLett = false;
            }
        }
    }
    while (c != EOF);

    fprintf(out, "%d", tot / cuv);

    return 0;
}