#include<fstream>
#include<string.h>
using namespace std;
int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    char s[102400];
    int k=0, nr=0, m, i=0;
    f.get(s,102400);
    f.close();
    while(!((int)s[i]>=97&&(int)s[i]<=122||(int)s[i]>=65&&(int)s[i]<=90))
    i++;
    for(;i<strlen(s);i++)
    {
        if((s[i]>='a'&&s[i]<='z')||((int)s[i]>=65&&(int)s[i]<=90))
        k++;
        if((((int)s[i]>=97&&(int)s[i]<=122)||((int)s[i]>=65&&(int)s[i]<=90))&&(!((int)s[i+1]>=97&&(int)s[i+1]<=122||(int)s[i+1]>=65&&(int)s[i+1]<=90)))
        nr++;
    }
  //  if((((int)s[i-1]>=97&&(int)s[i-1]<=122)||((int)s[i-1]>=65&&(int)s[i-1]<=90)))
      // nr++;
    m=k/nr;
    g<<m;
    g.close();
    return 0;
}