#include <iostream>
#include <fstream>
using namespace std;
ifstream in ("text.in");
ofstream out("text.out");
char c, lastchar;
int lenact=0, lent=0, nrcuv=0;
int main()
{
    in>>noskipws;
    do
    {
        in>>c;
        if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
            lent++, lenact++;
        else if(lenact>0) nrcuv++;
        lastchar=c;
        //cout<<(int) c<<endl;
    }
    while(c!=0&&c!='\n');

    out<<lent/nrcuv;
    //cout<<lent<<" "<<nrcuv;
    return 0;
}