#include <stdio.h>
#include <ctype.h>

int main(){
char c;
long litere=0,aux=0,cuv=0;
int flag=1;

FILE *f=fopen("text.in","r");

while(!feof(f)){
  fscanf(f,"%c",&c);
  if(isalpha(c)) aux++;
  if(isdigit(c)) 
    if(aux) 
       flag=0; 
  if(c==' '){ 
    if(flag){
      litere+=aux;     
      cuv++;
      aux=0;
     }
  else {
    aux=0;
    flag=1;
  }
 }
}
FILE *g=fopen("text.out","w");

fprintf(g,"%ld\n",litere/cuv);
fclose(g);
return 0;
}