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#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int i,j,nr,s,n;
char a[2000],*p,sep[20]=",.!?)('- ;:/|}{][_",v[500][50];
int main()
{ while(f.getline(a,1000)) {
p=strtok(a,sep);
while(p) {
strcpy(v[++n],p);
p=strtok(NULL,sep);
}
}
for(j=1;j<=n;j++) {
s=s+strlen(v[j]);
}
if(n!=0) nr=s/n;
else nr=0;
g<<nr;
return 0;
}