#include <stdio.h>
#include <string.h>
#include <ctype.h>
using namespace std;
FILE *f=fopen("text.in","r");
FILE *g=fopen("text.out","w");


bool cuvant;
char c;
int cuvinte,lit;

int main(){
cuvant=0;
lit=0;
cuvinte=0;
while(!feof(f)){
fscanf(f,"%c",&c);
if(isupper(c)or islower(c)){lit++;cuvant=1;} else if(cuvant){cuvant=0;cuvinte++;}
}

fprintf(g,"%d",lit/cuvinte);



fclose(g);
return 0;
}