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

using namespace std;

ifstream fin("text.in");
ofstream fout("text.out");

int main()
{
    int nrcuv = 1, nrlit = 0;
    char chestie[999999];
    fin.getline(chestie, 999999);
    for (int i = 0; i <= strlen(chestie); i++)
    {
        if ((chestie[i] == ' ' && (chestie[i-1] >= 'a' && chestie[i-1] <= 'z' || chestie[i-1] >= 'A' && chestie[i-1] <= 'Z') && (chestie[i+1] >= 'a' && chestie[i+1] <= 'z' || chestie[i+1] >= 'A' && chestie[i+1] <= 'Z')) || chestie[i] == '-' && (chestie[i-1] >= 'a' && chestie[i-1] <= 'z' || chestie[i-1] >= 'A' && chestie[i-1] <= 'Z') && (chestie[i+1] >= 'a' && chestie[i+1] <= 'z' || chestie[i+1] >= 'A' && chestie[i+1] <= 'Z')) nrcuv++;
        if (chestie[i]>='a'&&chestie[i]<='z'||chestie[i]>='A'&&chestie[i]<='Z') nrlit++;
    }
    fout << nrlit/nrcuv;
    return 0;
}