#include <iostream>
#include <fstream>
#include <cstring>
#include <string>
#include <climits>
#include <algorithm>
using namespace std;


#define MAX 1500000000


bool litera(char x)
{
    if(x<='z' && x>='a')
        return true;
    if(x<='Z' && x>='A')
        return true;
    return false;
}

int main()
{
    ifstream fin ("text.in");
    ofstream fout("text.out");
    char a,b;
    long long int l=0, c=0;
    fin.get(a);
    if(litera(a))
    {
        l++;
    }
    while(fin.get(b))
    {
        if(litera(b))
        {
            l++;

        }
        else if(litera(a))
        {
            c++;
        }
        a=b;
    }
    if(litera(a))
        c++;

    fout<<l/c;

    return 0;
}