#include<stdio.h>   

  
  
  
FILE *f=fopen("text.in","r"),*g=fopen("text.out","w");

char s1,s2;
int i,lit,nrcuv;


int litera(char x)
{if(x>='A' && x<='z')return 1;
else return 0;}






int main(){
fscanf(f,"%c %c",&s1,&s2);

if(litera(s1)){lit++; }
if(litera(s2)){lit++; }
if(litera(s1)==1 && litera(s2)==0)nrcuv++;

s1=s2;

while(!feof(f)){


fscanf(f,"%c",&s2);

if(litera(s2))lit++;
if(litera(s1)==1 && litera(s2)==0)nrcuv++;
s1=s2;
}




fprintf(g,"%d",lit/nrcuv);
fcloseall();




return 0;}