#include <stdio.h>
int inline lit(char c){
	if(c<='z' && c>='a' || 	c<='Z' && c>='A' ) return 1;
	return 0;
	
}
int main(){
 FILE *in,*out;
 in=fopen("text.in","r");
 out=fopen("text.out","w");
 char c,a=0;
 int total=0,cuvinte=0;
 while(	fscanf(in,"%c",&c) !=-1) {
 	if(lit(c)) {
	 	total++;
	 	if(!lit(a)) cuvinte++; 
 	}
 	a=c;
 }
 	fprintf(out,"%d\n",total/cuvinte);
 	return 0;
}