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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char x[10000005];
int k,l;
int main ()
{
int i;
k=0;
l=0;
while(!f.eof())
{
f.getline(x, 100000000);
int p=strlen(x);
for(i=0; i<p; i++)
{
if(isalpha(x[i]))
{
k++;
while(isalpha(x[i]))
{
l++;
i++;
}
}
}
}
if(k==0) g<<0;
else
g<<(l/k);
//g<<k<<" "<<l;
}