#include <cstdio>
#include <cstring>
using namespace std;
 
FILE *f=fopen ("text.in","r");
FILE *g=fopen ("text.out","w");
 
int main(){
    int i,lgcuv=0,cuv=0;
    bool reset=0;
    char x;
     
     
    while (x!=EOF){
        x=EOF;
        fscanf (f,"%c",&x);
        if ((x>=97 && x<=122) || (x>=65 && x<=90)){
            lgcuv++;
            if (!reset){
                cuv++;
            }
            reset=1;
        }
        else{
            reset=0;
        }
    }
    fprintf (g,"%d",lgcuv/cuv);
     
     
    return 0;
}