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#include <fstream>
#include <cstring>
using namespace std;
ifstream f("text.in");
ofstream g("text.out");
int nr=0;
int lg=0;
char s[10000];
bool litera(char c)
{
if((c>='a'&&c<='z')||(c>='A'&&c<='Z'))
return true;
return false;
}
int main()
{
f.getline(s,sizeof(s));
for (int i = 0 ; i < strlen(s); i ++ )
{
if(litera(s[i])==true)
{
nr++;
while(litera(s[i])==true)
{
lg++;
i++;
}
i--;
}
}
// g << lg << " " <<nr <<" " ;
if (nr>0)
g << lg/nr;
else
g <<"0";
return 0;
}