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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int nrcarac,nrcuv,n;
string s,t;
int main()
{
getline(f,s);
n=s.size();
for (int i=0;i<=n;++i)
{t="";
while (i<=n && isalpha(s[i])) {
nrcarac++;
t=t+s[i];
++i;
}
if (t!="") nrcuv++;
}
if (nrcuv==0) g<<0;
else g<<nrcarac/nrcuv;
}