using namespace std;
#include<stdio.h>
#include<cstring>
FILE *in=freopen("text.in","r",stdin),*out=freopen("text.out","w",stdout);

int main(){
    char v[100005];
    fgets(v,100005,stdin);
    int lit=0,cuv=0,trecut=1;
    for(int i=0;i<strlen(v);i++){
        if(('a'<=v[i] && v[i]<='z') || ('A'<=v[i] && v[i]<='Z')){
            lit++;
            trecut=0;
        }
        else if(trecut=0){
            cuv++;
            trecut=1;
        }

    }
    if(trecut==0)
        cuv++;
    fprintf(stdout,"%d",lit/cuv);
    fclose(stdout);
    return 0;
}