#include<string.h>
#include <fstream>
using namespace std;
long long lit,cuv;
bool b;
int main()
{
  FILE *fin,*fout;
  fin=fopen ("text.in","r");
  fout=fopen ("text.out","w");

    char c;
    while(!feof(fin))
    {
                
                fscanf(fin,"%c",&c);
     
            if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
            { 
                lit++;
                b=1;
            }
            else    if(b==1)
            {
                       cuv++; 
                       b=0;
            }
                   
    }
    if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
        ++cuv;
    fprintf(fout,"%d",lit/cuv);

}