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

int main()
{ifstream f("text.in");
ofstream g("text.out");
char n[100000],m=' ',i=1;
long lit=0,cuv=0;
while(f.getline(n,100000))
{i=1;
while(i<=strlen(n))
{if(((n[i]>=97)&&(n[i]<=122))||((n[i]<=90)&&(n[i]>=65)))
   {lit++;
if((m<65)||((m>90)&&(m<97))||(m>122))
cuv++;}
m=n[i];
i++;}
}

g<<lit/cuv;
f.close();
g.close();
return 0;
}