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#include <iostream>
#include <fstream>
#include <string>
using namespace std;
string s;
int i,len,nr,sum;
int main()
{
ifstream f("text.in");
ofstream g("text.out");
while(getline(f,s))
{
s.push_back(' ');
for(i=0;i<s.size();i++)
{
if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
len++;
else
{
if(len!=0)
{
sum+=len;
len=0;
nr++;
}
}
}
}
if(nr==0) {g<<"0";return 0;}
g<<sum/nr;
return 0;
}