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

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

int main(){
		char s[1100000],d=26;
		int nrcuv,nrlit,i,n;
		in.get(s,1100000,d);
		in.get();
		n=strlen(s);
		nrcuv=nrlit=0;
		if(isalpha(s[0])) nrlit++;
						  nrcuv++;
		
		for(i=0;i<n;i++){
			if(isalpha(s[i])){ nrlit++;
				if(!isalpha (s[i-1])) nrcuv++;
			}
		}
	out<<nrlit/nrcuv;
}