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#include <fstream>
#include <cstring>
#include <cstdio>
using namespace std;
//FILE *fin=fopen("text.in","r")
ifstream fin("text.in");
ofstream fout("text.out");
long long i,l,k,nr,nre,n;
char s[999999],cuv[999999];
int main()
{
fin.getline(s,999999);
i=0;
n=0;
while(i<strlen(s))
{
while(strchr(" .,;:!?-",s[i])!=0&&i<strlen(s))
i++;
k=0;
while((s[i]>='A'&&s[i]<='Z')||(s[i]>='a'&&s[i]<='z'))
cuv[k++]=s[i++];
if(k>0)
{
cuv[k]=0;
nr+=strlen(cuv);
nre++;
}
}
if(nre!=0)
fout<<nr/nre;
return 0;
}