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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];
int 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++;
}
g<<(float)sum/nr;
f.close();
g.close();
}