#include<fstream>
#include<string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
long i,nr,nr1;
char a[1000000];
int main()
{
    nr=0;
    nr1=0;
while(!f.eof())
{
f.getline(a,1000000);
for(i=0;i<strlen(a);i++)
{
if((isalpha(a[i])!=0) && (isalpha(a[i+1])==0)) nr++;
if(isalpha(a[i])!=0) nr1++;
}
if(nr!=0) g<<nr1/nr;
else g<<"0";
}
f.close();
g.close();
return 0;
}