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#include <iostream>
#include <fstream>
using namespace std;
ifstream fi("text.in");
ofstream fo("text.out");
char c;
int main()
{
int nr=0,l=0;
char p=',';
while (!fi.eof())
{
fi.get(c);
if ((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
l++;
else
if ((p>='a'&&p<='z')||(p>='A'&&p<='Z'))
nr++;
p=c;
}
if ((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
nr++;
fo<<l/nr;
}