#include <iostream>
#include<fstream>
#include<cstring>
using namespace std;
char sir[101];
int main()
{
    ifstream f("text.in");
    ofstream g("text.out");
    int lg=0;
    while(f>>sir){
        ++lg;
    }

    int r=0;
    int nc=0;
    for(int i=0;i<lg;++i){
        if(isalpha(sir[i])){
            r=r+1;
        }
    }
      for(int i=0;i<lg;++i){
            if(isalpha(sir[i])){
                ++nc;
                while(isalpha(sir[i])){
                    ++i;
                }
                --i;

            }
}
g<<r/nc;

    return 0;
}