#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{
    char c[100];
    fin.get(c,100);
    int l=0, cuv=0;
    for(int i=0; c[i];i++)
        if(strchr(" -,", c[i]))
            cuv++;
        else
            if(strchr("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz", c[i]))
                l++;
    int media;
    media=l/cuv;
    fout<<media;
    return 0;
}