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#include<fstream>
#include<cstring>
using namespace std;
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{
int cuv=0;
int lit=0;
string s;
bool cuva;
while(fin>>s)
{
cuva=true;
for(int i=0;i<s.length();i++)
{
if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
{
lit++;
if(cuva) {cuv++; cuva=false;}
}
else cuva=true;
}
}
fout<<lit/cuv;
}