#include <fstream>
#include <string.h>
#include <stdlib.h>

using namespace std;
int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");
    char s[2000];
    int c=0,l=0;
    fin.getline(s,2000);
    for(int i=0;i<strlen(s);i++)
        if(s[i]==' ')c++;
        else if(s[i]>='a'&&s[i]<='z')l++;
        else if(s[i]>='A'&&s[i]<='Z')l++;
    c++;
    fout<<l/c;



}