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


int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");
    char s[100];
    int n,i,lit=0,cuvinte=0;

    fin.getline(s,100);
    n=strlen(s);
    for(i=0;i<=n-2;++i)
    {
        if(isalpha(s[i]))lit++;
        if(isalpha(s[i])&&!isalpha(s[i+1])) cuvinte++;

    }
    fout<<(int)lit/cuvinte;
    return 0;
}