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#include <iostream>
#include <fstream>
#include <string.h>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
char text[100030];
int main()
{
int iNrChar=0, iNrWords=0;
f.getline(text,100030);
for(int i=0; i<strlen(text); i++)
if(isalpha(text[i])) {
++iNrChar;
if(i == 0)
++iNrWords;
else if(!isalpha(text[i-1]))
++iNrWords;
}
g<<iNrChar/iNrWords;
return 0;
}