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

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

while(fscanf(f,"%c",&x)!=EOF)
{k++;
if ((int)x>=0&&(int)x<=64||(int)x>=91&&(int)x<=96||(int)x>=123)
    {litere+=w-q+1;
     cuvinte++;}
if ((int)x>=65&&(int)x<=90||(int)x>=97&&(int)x<=122||(int)x>=85&&(int)x<=94)
    {if ((int)aux>=0&&(int)aux<=64||(int)aux>=91&&(int)aux<=96||(int)aux>=123) q=k;
     w=k;}
aux=x;

}
cuvinte++;
sol=litere/cuvinte;
fprintf(g,"%d",sol);
fclose(f);   
fclose(g);   
return 0;   
}