#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{
    char s[1500000];
    fin.getline(s,1500000);
    int i=0,nr=0,cv=1;
    while(s[i])
    {
        if( (s[i]>='a'&&s[i]<='z') || (s[i]>='A'&&s[i]<='Z') )
            nr++;
        else if(s[i]==' ') cv++;
        i++;
    }
    fout<<nr/cv;
    fin.close();
    fout.close();
    return 0;
}