#include <iostream>
#include <fstream>

using namespace std;

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

int lit,cuv;
char x,lastx;

int main()
{
    while (fin.get(x))
        {
            if ( ( x>='A' && x<='Z' ) || ( x>='a' && x<='z' ) ) lit++;
            else if ( ( lastx>='A' && lastx<='Z' ) || ( lastx>='a' && lastx<='z' ) ) cuv++;
            lastx=x;
        }
    if (cuv>0) fout<<lit/cuv;
    else fout<<0;
    return 0;
}