#include <stdio.h>
char h,ch;
int main()
{
int e=0,i,rez,nrca=0,nrcuv=0;
freopen("text.in", "r",stdin);
freopen("text.out", "w",stdout);

while(!feof(stdin) )
{
scanf("%c", &ch);	
if((ch>='A' && ch<='Z') || (ch>='a' && ch<='z'))
	{++nrca; if(h<'A'  || ( h>'Z' && h<'a') || h>'z') ++nrcuv;}  
 
h=ch;
}

rez=nrca/nrcuv;
printf("%d", rez);
return 0;
}