#include <fstream>
#include <iostream>
using namespace std;
ifstream f ("text.in");
ofstream g ("text.out");
long long i,k,c;
char s[2000000000];
int main()
{
    f.getline (s,2000000000);
    for (i=0;s[i]!=0;i++)
    {
        if ((s[i]>='A'&&s[i]<='Z')||(s[i]>='a'&&s[i]<='z'))
        {
            k++;
        }
        else if ((s[i-1]>='A'&&s[i-1]<='Z')||(s[i-1]>='a'&&s[i-1]<='z')) c++;
    }
    g<<k/c;
    return 0;
}