#include<cstdio>
int i,j,nl,nc,ok;
char s[2030*2030],c;
FILE *f,*g;
int main(){
    f=fopen("text.in","r");
    g=fopen("text.out","w");
    fgets(s,2030*2030,f);
    nl=0;
    nc=0;
    i=0;
    while(!feof(f)){
        fgets(s,2030*2030,f);
    if(('a'<=s[i] && s[i]<='z')||('A'<=s[i] && s[i]<='Z'))
            nl++;
    for(i=1;s[i]!=0;i++){
        if(('a'<=s[i] && s[i]<='z')||('A'<=s[i] && s[i]<='Z')){
            nl++;
            ok=1;
        }
        else if(ok==1){
            nc++;
            ok=0;
        }
    }
    }
    if(ok==1)
        nc++;

    fprintf(g,"%d",nl/nc);


    fclose(f);
    fclose(g);
    return 0;
}