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