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#include <iostream>
#include <fstream>
#include <cstring>
#include <cctype>
using namespace std;
char nr,len;
char sep[]=" 1234567890-.,<>?/\\;:\'\"!~";
int main()
{
ifstream fin("text.in");
char c=fin.get();
bool word=0;
while(!fin.eof())
{
if(isalpha(c))
{
++len;word=1;
}
if(strchr(sep,c) && word==1)
{
++nr;
word=0;
}
c=fin.get();
}
ofstream fout("text.out");
fout<<(char)len/nr;
return 0;
}