#include <fstream>
#include <cstring>

using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char s[1000001];
int main()
{
    long  l=0,cv=0,i;
    f.getline(s,1000001);
    i=0;
    if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z')) l++;
    for(i=1;i<strlen(s);i++)
    {
        if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z')) l++;
        else
        {
            if((s[i-1]>='a'&&s[i-1]<='z')||(s[i-1]>='A'&&s[i-1]<='Z')) cv++;
        }
    }
    g<<l/cv;
    return 0;
}