#include<fstream.h>
#include<string.h>


ifstream in("text.in");
ofstream out("text.out");

int main(){
	char s[1000101];
	int ln,m,cuv=1,i,p;
	in.get(s,1000101);
	in.get();
	ln=strlen(s);
	for(i=0;i<ln;i++){
		if((s[i]<='z' && s[i]>='a')||(s[i]<='Z' && s[i]>='A')){m++;
		p=1;}
		
		else if(p==1){cuv++;
		p=0;}
		
	}
	if(p==1)cuv++;
	if(m==0||cuv==0)
		out<<0;
	else out<<m/cuv;
	
}