//http//infoarena.ro/problema/text

#include<fstream.h>
#include<string.h>
#include<stdio.h>
#define NM 1048576
int main()
{
ifstream fin("text.in");
ofstream fout("text.out");
int l,i,cuv=0,car=0;
char s[NM+10];
fin.get(s,NM);
l=strlen(s);
for(i=0;i<l;i++){
	if(s[i]>='a'&&s[i]<='z'||s[i]>='A'&&s[i]<='Z')car++;
	if((s[i]>='a'&&s[i]<='z'||s[i]>='A'&&s[i]<='Z')&&
	   !(s[i+1]>='a'&&s[i+1]<='z'||s[i+1]>='A'&&s[i+1]<='Z'))cuv++;
	}
if(car==0) fout<<"0";
else
fout<<car/cuv;
return 0;

}