#include<stdio.h>
#include<string.h>
#include<stdlib.h>
int main()
{
    FILE *f=fopen("text.in","r"),*p=fopen("text.out","w");
    char *s;
    int i,l=0,nr=0;
    s=malloc(10000*sizeof(char));
    fgets(s,10000,f);
    for(i=0;i<strlen(s);i++)
        if((s[i]>='a' && s[i]<='z') || (s[i]>='A' && s[i]<='Z')) {l++;
                                                        if((s[i+1]==' ') || (s[i+1]=='!') || (s[i+1]=='-') || (s[i+1]==',' ) || (s[i+1]=='?') ||(s[i+1]==';') || (s[i]==':')) nr++;
                                                        }
     fprintf(p,"%d",l/nr);
     fclose(f);
     fclose(p);
     return 0;
}