#include<cstdio>
#include<cstdlib>
using namespace std;
#define FIN "text.in"
#define FOUT "text.out"
int main()
{FILE *fi=fopen(FIN,"r");
 FILE *fo=fopen(FOUT,"w");

char c;
long long contor=0,lg=0,curent=0;
while(fscanf(fi,"%c", &c)!=EOF)
 {if(('a'<=c && c<='z')||('A'<=c && c<='Z'))
  {lg++;
  if(curent==0) curent=1;
             }
   else {if(curent==1) {curent=0;contor++;}
        }          
        }
   if(curent==1) contor++;      
  fprintf(fo,"%ld",lg/contor);      
    
    return 0;}