#include <fstream>

using namespace std;

ifstream cin("text.in");
ofstream cout("text.out");

char c;
char a= '+';
int litere,cuv;

int main()
{
    while(cin.get(c))
    {
        if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
        {
            litere++;
            if(!((a>='a'&&a<='z')||(a>='A'&&a<='Z')))
                cuv++;

        }
        a=c;
    }
    cout<<litere/cuv;
    return 0;
}