#include <bits/stdc++.h>

using namespace std;
ifstream in("text.in");
ofstream out("text.out");

int main()
{
    char a[1000000];
    in.getline(a, 1000000);
    long lit = 0, cuv = 0;
    for(int i = 0; a[i] != 0; i++)
    {
        if((a[i] >= 'a' && a[i] <= 'z')
        || (a[i] >= 'A' && a[i] <= 'Z'))lit++;
        else if((a[i - 1] >= 'a' && a[i - 1] <= 'z')
        || (a[i - 1] >= 'A' && a[i - 1] <= 'Z'))cuv++;
    }
    out << lit / cuv;
    return 0;
}