#include <iostream>
#include <fstream>
#include <cstring>

using namespace std;

ifstream f("text.in");
ofstream g("text.out");

int main()
{
    bool ok = false;
    int cuv = 0;
    long long int nr_lit = 0;
    char x,y;
    while(f.get(x)){
        if((x >= 'a' && x <= 'z') || (x >= 'A' && x <= 'Z'))
            nr_lit++;
        else
            if((y >= 'a' && y <= 'z') || (y >= 'A' && y <= 'Z'))
                cuv++;
        y = x;
    }
    g << nr_lit / cuv;
    return 0;
}