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#include <iostream>
#include <string>
#include <fstream>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
string cuv;
int main()
{
string line="";
int cnt=0,car=0,lit=0;
while(getline(in,line))
{
for(int i=0;i<line.size();++i)
{
if(isalpha(line[i]))
{
++car;
++lit;
}
else
{
if(lit!=0)++cnt;
lit=0;
}
}
if(lit!=0)
{
++cnt;
lit=0;
}
}
if(cnt!=0)out<<car/cnt;
else out<<"0";
return 0;
}