#include <stdio.h>
#define litere(x) ((x>='a'&&x<='z')||(x>='A'&&x<='Z'))

int cuvinte,litere;
char prv,crt;

int main(){
 freopen("text.in","r",stdin);
 freopen("text.out","w",stdout);
 
 while(scanf("%c",&crt)!=EOF){
    if(litere(crt))
        {litere++;
        if(!litere(prv))
            cuvinte++;
        }
    prv=crt;
    }

 printf("%d",litere/cuvinte);
 
 return 0;
}