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#include <iostream>
#include <string>
#include <fstream>
using namespace std;
ifstream in("text.in");
ofstream out("text.out");
int tcuvinte(string s)
{int cuvinte=0,d;
for(int p=1;p<=s.size();p++)
{d=p+1;
if(isalpha(s[p])&& !isalpha(s[d]))
cuvinte++;
}
return cuvinte;
}
int main()
{string text;
int cifre=0;
getline(in,text);
for(int i=1;i<=text.size();i++)
if(isalpha(text[i])) cifre++;
out<<cifre/tcuvinte(text);
return 0;
}