#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
ifstream fin ("text.in");
ofstream fout ("text.out");
char a[1000];
int main()
{
    int lungime=0,i=0, nr=0,flag=0;
    while(fin.get(a[i]))
    {
        if((a[i]>='a' && a[i]<='z') || (a[i]>='A' && a[i]<='Z'))
            {lungime++;flag=1;}
        else
            if(flag==1)
                {nr++;flag=0;}
        i++;
    }
    if (nr==0)
        {fout<<0;return 0;}
    fout<<lungime/nr;
    return 0;
}