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#include <fstream>
#include <cstring>
#define NM 2000000
using namespace std;
ofstream fout("text.out");
FILE * fin;
char x;
long long nr, lng, total, sz;
int main()
{
int i;
fin = fopen("text.in", "r");
lng=0;
nr=0;
total=0;
while (fscanf(fin, "%c", &x)!=EOF)
{
if (isalpha(x))
{
lng++;
}
else
{
if (lng)
{
nr++;
total+=lng;
}
lng=0;
}
}
if (lng)
{
nr++;
total+=lng;
}
fout<<total/nr;
return 0;
}