# include <cstdio>
using namespace std;
FILE *fin=fopen("text.in" ,"r");
FILE *fout=fopen("text.out","w");
int nrc,nr,s;
char t;
int main () {
    while(t!='~'){
        t='~';
        fscanf(fin,"%c",&t);
        if((t>='a'&&t<='z')||(t>='A'&&t<='Z'))
            nr++;
        else{
            if(nr>0)
                nrc++;
            s+=nr;
            nr=0;
        }
    }
    s/=nrc;
    fprintf(fout,"%d",s);
    return 0;
}