#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
char a,b;
long int x,y;
int main()
{
    ifstream fin("text.in");
    ofstream fout("text.out");
    b=' ';
    while( fin.get(a) )
    {
        if(((65<=a)&&(a<=90))||((97<=a)&&(a<=122)))x++;
        else
        {
        if(((65<=b)&&(b<=90))||((97<=b)&&(b<=122))) y++;
        }
        b=a;
    }
    fout<<x/y;
}