#include <iostream>
#include<fstream>
using namespace std;

ifstream fin ("text.in");
ofstream fout ("text.out");

char c, cant=0;
int lung=0, nrcuv=0;

int main()
{
    while(c!=EOF)
    {
    c=fin.get();
        if(c>='a' && c<='z') || (c>='A' && c<='Z')
        lung++;
    else
        if(cant>='a' && cant<='z') ||(cant>='A' && cant <='Z')
        nrcuv++;
    cant = c;
    }
    fout<<lung/nrcuv;
    return 0;
}