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#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;}