#include<fstream.h>
#include<stdio.h>
#define NM 1048576
#include<string.h>
int main(){
ifstream fin("text.in");
ofstream fout("text.out");
char s[NM+10];
int i,nc=0,l,nrc=0;
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') nrc++;
	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')	 )nc++;
	}
fout<<nrc/nc;
return 0;
}