#include <fstream>

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

int main()
{
    int lun=0,cnt=0;
    char s,last;
    last=0;
    while(fin.get(s))
    {
        if((s>='A'&&s<='Z')||(s>='a'&&s<='z')) lun++;
        else if(((last>='A'&&last<='Z')||(last>='a'&&last<='z'))&&((s<'A'||s>'Z')||(s<'a'||s>'z'))) cnt++;
        last=s;
    }
    fout<<lun/cnt<<"\n";
    return 0;
}