#include <iostream>
#include <fstream>
using namespace std;
int i,n,lit,cuv;
string s;
int main()
{
    ifstream f ("text.in");
    ofstream g ("text.out");
    getline (f,s);
    n=s.size()-1;
    for (i=0; i<=n; i++)
        if ((s[i]<='z' && s[i]>='a') || (s[i]>='A' && s[i]<='Z')) lit++;
        else if ((s[i-1]>='a' && s[i-1]<='z') || (s[i-1]>='A' && s[i-1]<='Z')) cuv++;
    if ((s[n]<='z' && s[n]>='a') || (s[n]>='A' && s[n]<='Z')) cuv++;
    g<<lit/cuv;
}