#include<stdio.h>
char x;
int cuvinte=0,litere=0,sol;

int main ()
{
FILE *f=fopen("text.in","r");
FILE *g=fopen("text.out","w");

while(fscanf(f,"%c",&x)!=EOF)
{
if (x=='\ ') cuvinte ++;
   else if ((int)x>=65&&(int)x<=90||(int)x>=97&&(int)x<=122)
	litere++;
}
cuvinte++;
sol=litere/cuvinte;
fprintf(g,"%d",sol);
fclose(f);
fclose(g);
return 0;
}