#include<stdio.h>
#include<string.h>
char a[1000000001];

long long i,k,nr,cuv;
int main()
{ freopen("text.in","r",stdin);
  freopen("text.out","w",stdout);
  a[0]=1;
   for(i=1;a[i-1];i++) { scanf("%c",&a[i]);
                         
                      // if(a[i]>='0'&&a[i]<='9') {  nr++;
                                                      //  if(!((a[i-1]>='0'&&a[i-1]<='9')||(a[i-1]>='A'&&a[i-1]<='Z')||(a[i-1]>='a'&&a[i-1]<='z')))
                                                     //  cuv++;
                                                 //   }   
                       if(a[i]>='A'&&a[i]<='Z') { nr++;
                                                        if(!((a[i-1]>='A'&&a[i-1]<='Z')||(a[i-1]>='a'&&a[i-1]<='z')))
                                                       cuv++;
                                                    }
                      else if(a[i]>='a'&&a[i]<='z') { nr++;
                                                        if(!((a[i-1]>='A'&&a[i-1]<='Z')||(a[i-1]>='a'&&a[i-1]<='z')))
                                                       cuv++;
                                                    }  
                          
                    } 
 if(!cuv||!nr) printf("0\n");
 else printf("%lld\n",nr/cuv);
 fclose(stdin);
 fclose(stdout);
 return 0;
}