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#include <iostream>
#include <cstring>
#include <fstream>
using namespace std;
char c;
ifstream fin("text.in");
ofstream fout("text.out");
int main()
{
int cuv=0 , lit=0 , ok=0;
while(fin.get(c))
{
if(ok==0)
{
if((c>='a' && c<='z')||(c>='A'&& c<='Z') )
{
cuv++;
lit++;
ok=1;
}
}
else if(ok==1)
{
if (( c>='a' && c<='z')||(c>='A' && c<='Z'))
lit++;
else ok=0;
}
}
fout<<lit/cuv;
fin.close();
fout.close();
return 0;
}