#include <fstream>
#include <cstdio>
#include <cstring>
using namespace std;
int lu,i,cu,su,ss;
char s[500010];
int main(){
    ifstream f ("text.in");
    ofstream g ("text.out");
    while(f>>s){
            lu=strlen(s);
            ss=0;
    for(i=0;i<lu;++i){
            if(s[i]<=90&&s[i]>=65)su++,ss++;
    else
        if(s[i]<=122&&s[i]>=97)su++,ss++;
    else
        if(ss>0)cu++,ss=0;}
        if(ss>0)cu++;}
    g<<su/cu;
    return 0;}