#include <iostream>
#include <fstream>
using namespace std;
string s;
long long n,i,l,c;
int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    getline(f,s);
    n=s.length();
    for (i=0;i<=n-1;i++)
    {
        if (((s[i]>=65) and (s[i]<=90)) or ((s[i]>=97) and (s[i]<=122))) l++;
        else if (((s[i+1]>=65) and (s[i+1]<=90)) or ((s[i+1]>=97) and (s[i+1]<=122))) c++;
    }
    g<<l/c;
    return 0;
}