#include<stdio.h>
#include<stdlib.h>
#include<string.h>


int main(){
FILE *in,*out;
int cuvinte=0;
int lungime=0;
int ok = 0;
char carac;
in = fopen("date.in","r");

while ( (carac = fgetc(in)) && !feof(in) ){
	if (((carac>='a') && (carac<='z')) || (( carac>='A') &&(carac<='Z'))){
		if (ok)
			lungime++;
		else {
			cuvinte++;
			ok=1;
			lungime++;
		}
	}
	else {
		if (ok)
			ok=0;
	}
}
fclose(in);
out = fopen("date.out","w");
fprintf(out,"%d\n",lungime/cuvinte) ;
fclose(out);
return 0;
}