#include<stdio.h>
#include<string.h>
char a[10000001];

long long i,k,nr,cuv;
int main()
{ freopen("text.in","r",stdin);
  freopen("text.out","w",stdout);
  fgets(a+1,10000000,stdin);
  k=strlen(a+1);
  a[0]=200;
  for(i=0;i<=k;i++) { if(a[i]>=48&&a[i]<=57) nr++;
                     else if(a[i]>=65&&a[i]<=90) nr++;
                     else if(a[i]>=97&&a[i]<=122) nr++; 
                     else if( (a[i+1]>=48&&a[i+1]<=57)||(a[i+1]>=65&&a[+1]<=90)||(a[i+1]>=97&&a[i+1]<=122))
                          cuv++;
                          
                    } 
 if(!cuv||!nr) printf("0\n");
 else printf("%lld\n",nr/cuv);
 fclose(stdin);
 fclose(stdout);
 return 0;
}