#include <iostream>
 #include<fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{
    char x,n,pr;
    int lit,cuv;
    while(fin.get(x))
        {
    if ((x>='a'&&x<='z')||(x>='A'&&x<='Z'))
        lit++;
    else
    if ((pr>='a'&&pr<='z')||(pr>='A'&&pr<='Z'))
        cuv++;
    pr = x;
    }
    fout<<lit/cuv;
    return 0;
}