#include <iostream>
#include <fstream>
#include <cstring>
#define MAX 100000000
using namespace std;

char c[MAX];

int main()
{
    ifstream in("text.in");
    ofstream out("text.out");
 bool ok = false;
 unsigned long lung =0 , cuv =0;
in.getline(c,MAX);

for(int i = 0 ; i  < strlen(c); i++)

       if(c[i] >='A' && c[i]<='z' && c[i]!='[' && c[i] != '\ ' && c[i] != ']' && c[i] != '`')
       {
           if(ok == false) cuv++;
           lung++;
           ok = true;

       }
       else
        ok = false;



   out<< lung/cuv;

    return 0;
}