#include<fstream.h>
#include <stdio.h>
ifstream f("text.in");
ofstream g("text.out");

long cuv=0,caract=0;
int k=0;
char a;

int main()
{

f.get(a);
while (a!=EOF)
{
  if ((a=='a')||(a=='b')||(a=='c')||(a=='d')||(a=='e')||(a=='f')||(a=='g')||
  (a=='h')||(a=='n')||(a=='t')||(a=='z')||(a=='K')||(a=='L')||(a=='R')||
  (a=='i')||(a=='o')||(a=='u')||(a=='A')||(a=='J')||(a=='M')||(a=='S')||
  (a=='j')||(a=='p')||(a=='v')||(a=='B')||(a=='I')||(a=='N')||(a=='T')||
  (a=='k')||(a=='q')||(a=='w')||(a=='C')||(a=='H')||(a=='O')||(a=='U')||
  (a=='l')||(a=='r')||(a=='x')||(a=='D')||(a=='G')||(a=='P')||(a=='V')||
  (a=='m')||(a=='s')||(a=='y')||(a=='E')||(a=='F')||(a=='Q')||(a=='W')||
  (a=='X')||(a=='Y')||(a=='Z')) {
				caract++;
				k=1;
				}
  else if (k==1) {cuv++; k=0;}

  f.get(a);
}
g<<(caract/cuv);
f.close();
g.close();
}