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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[1000000];
float l=0,nr=0,sum=0;
while(f.get(s,1000000)){
//char *p =strtok(s,"`!\"$%^&*()_+=-");
for(int i=0;i<strlen(s);i++)
if(('a'<=x && x<='z') || ('A'<=x && x<='Z')) l++;
else{
if(l){
sum=sum+l;
nr++;
}
}
if(l) {
sum+=l;
nr++;
}
}
if(nr!=0)g<<sum/nr<<endl;
else g<<0;
f.close();
g.close();
}