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

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

char s[1000000],sep[]=" ,-.!?",*p;
int np,cuv,total,med;
int main(){
fgets(s,1000000,f);
cuv=0;
total=0;
p=strtok(s,sep);
while(p){
np=strlen(p);
total+=np;
cuv++;
p=strtok(NULL,sep);
}
med=total/cuv;
fprintf(g,"%d",med);


fclose(g);
return 0;
}