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#include <iostream>
#include <fstream>
#include <cmath>
#include <cstring>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
int main()
{
char s[1001],*p;
long long l,i,j,ct=0,nrcv=0;
in.get(s,1001);
while(in.get(s,1001)){
int l=strlen(s)-1;
for(i=0;i<=l;i++){
j=i;
while(isalpha(s[j])&&j<l)
j++;
ct=ct+j-i;
if(j>i) nrcv++;
i=j;
}
}
if(nrcv==0) out<<0;
else
out<<ct/nrcv;
return 0;
}