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#include <iostream>
#include <fstream>
using namespace std;
int main()
{
ifstream in("text.in");
ofstream out("text.out");
string s;
int i,ttot=0,cuvtot=0,cuv,t;
bool a;
while (!in.eof())
{
a=true;
cuv=0;
t=0;
getline(in,s);
for (i=0;i<s.length();i++)
{
if ((s[i]>='A'&&s[i]<='Z')||(s[i]>='a'&&s[i]<='z'))
{
t++;
if (cuv==0)
{
cuv++;
}
a=true;
}
else
{
if(a)cuv++;
a=false;
}
}
cuvtot+=cuv;
ttot+=t;
}
out<<(int)ttot/cuvtot;
}