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#include <iostream>
#include <fstream>
using namespace std;
bool k=true;
string s;
long x=0,i,n,q=0,x1=0;
int main()
{
ifstream f("text.in");
ofstream g("text.out");
while(!f.eof())
{
getline(f,s);
n=s.size();
for(i=0;i<n;i++)
{
if((s[i]>='A' and s[i]<='Z') or (s[i]>='a' and s[i]<='z'))
{
x++;
x1=x;
if(k==true)
k=false;
}
else
if(k==false and x1!=0)
{
q++;
k=true;
}
}
x1=0;
}
if(q>0)
g<<x/q;
else
g<<0;
return 0;
}