#include <iostream>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");

int main()
{int k , s , ok;
char c;
 while(f.get(c))
 {
     if (ok==0)
        {if (c<='a' && c<='z' || c<='A'&&c<='Z')
        ok =1;}
     if(ok==1)
        {if (c<='a' && c<='z' || c<='A'&&c<='Z')
        k++;}
     else {s++; ok=0;}
 }
 g<<k/s;
    return 0;
}