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#include <iostream>
#include<string.h>
#include<fstream>
using namespace std;
int i,nr,n,nr2=0;
char text[260];
int main()
{ifstream f("text.in");
ofstream g("text.out");
while(!f.eof())
{
f.getline(text,260);
n=strlen(text);
for(i=0;i<=n-1;i++)
if(text[i]==' ')
nr++;
nr++;
if(text[0]==' ')
nr--;
if(text[n-1]==' ')
nr--;
for(i=0;i<n-1;i++)
{
nr2++;}}
g<<nr2/nr;
g.close();
f.close();
return 0;
}