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#include <iostream>
#include <cstring>
#include <cctype>
#include <fstream>
using namespace std;
ifstream fin ("text.in");
ofstream fout("text.out");
long long nrc,nrl,s;
char c,sep[]=",.-;";
int main()
{
while(fin.get(c))
{
if((c>='a' && c<='z') || (c>='A' && c<='Z'))
{
nrl++;
}
else
{
if(nrl>0)
{
nrc++;
}
s=s+nrl;
nrl=0;
}
}
fout <<s/nrc;
return 0;
}