#include <stdio.h>
#include <stdlib.h>

int main()
{   FILE*fi,*fout;
    int nr,con,flag;
    char a;
    fi=fopen("text.in" ,"r");
    fout=fopen("text.out" ,"w");
    a=fgetc(fi);
    con=0;
    nr=0;
    flag=0;
    while(a!='\n')
    {
       if((a>='a'&&a<='z')||(a>='A'&&a<='Z'))
        {
        while((a>='a'&&a<='z')||(a>='A'&&a<='Z'))
        {
            nr++;
            a=fgetc(fi);
        }
        flag=1;
        }
        if(flag==1)
            con++;
        while((a==' ')||(a=='-')||(a=='!')||(a=='.')||(a=='?'))
            a=fgetc(fi);
        flag=0;
    }
    fprintf(fout,"%d" ,nr/con);
    fclose(fi);
    fclose(fout);
    return 0;
}