#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
long long nrlit,nrcuv;
char c,uc;
int main()
{
    while(fin.get(c))
    {
        if((c>='A'&&c<='Z')||(c>='a'&&c<='z'))nrlit++;
        else if((uc>='A'&&uc<='Z')||(uc>='a'&&uc<='z'))nrcuv++;
        uc=c;
    }
    if((c>='A'&&c<='Z')||(c>='a'&&c<='z'))nrcuv++;
    if(c!=0)fout<<nrlit/nrcuv;
    else fout<<0;
    return 0;
}