#include <string.h>
#include <fstream>
#include <cmath>
using namespace std;

int main()
{
    char a,b;
    int x=0,y=0;
    ifstream f("text.in");
    ofstream g("text.out");
    while(f.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;
    }
    g<<x/y;
    return 0;
}