#include<fstream>
#include<string>

using namespace std;

ifstream f("test.in");
ofstream o("test.out");

string mes;
char c;


int main()
{
    getline(f,mes);
	int words=1,totlength=0,i=0;
	while(!((mes[i]>='A'&&mes[i]<='Z')||(mes[i]>='a'&&mes[i]<='z')))
        {i++;}
	for(;i<mes.length();i++)
    {
        if(mes[i]==' '||mes[i]=='-')
            words++;
        else
        if((mes[i]>='A'&&mes[i]<='Z')||(mes[i]>='a'&&mes[i]<='z'))
            totlength++;
    }
    o<<totlength/words;
	return 0;

}