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#include<iostream>
#include<fstream>
#include<string.h>
using namespace std;
int main()
{ ifstream f("text.in");
ofstream g("text.out");
char s[1050000];
float l=0,nr=0,sum=0;
f.get(s,1050000);{
for(int i=0;s[i];i++)
if((s[i]>=65&&s[i]<=90)||(s[i]>=97&&s[i]<=122)) l++;
else{
if(l){
sum=sum+l;
nr++;
l=0;
}
}
if(l) {
sum+=l;
nr++;
}
}
if(nr!=0)g<<sum/nr<<endl;
else g<<0;
f.close();
g.close();
}