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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
bool cuv(char a)
{
return ((a<'a' || a>'z') && (a<'A' || a>'Z'));
}
int main()
{
string s;
int cont=0, c=0;
while(getline(fin,s))
{
for(int i=0;i<=s.size();i++)
{
if(isalpha(s[i]))++cont;
}
for(int i=1;i<=s.size();i++)
{
if(cuv(s[i]) && cuv(s[i-1])==0)
{
++c;
}
}
}
if(c==0 || cont==0)fout<<0;
else fout<<int(float(cont)/c);
return 0;
}