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#include <iostream>
#include <fstream>
#include <cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
char sep[256];
const int MAX=1e6+5;
int nrcuv,nrlit,k;
char ch[MAX],*p;
int main()
{
for(int i=1;i<256;i++)
if(!isalpha(i))
sep[k++]=i;
fin.getline(ch,MAX);
p=strtok(ch,sep);
while(p)
{
nrlit+=strlen(p);
nrcuv++;
p=strtok(NULL,sep);
}
fout << nrlit/nrcuv;
return 0;
}