#include <stdio.h>
#include <string.h>

char s[210000];
int t[110000];
long long a[110000];
long long b[110000];
int n;

int main()
{
  int i;
  long long r1;
  while (1)
  {
    s[0]=0;
    gets(s);
    if (s[0]==0) break;
    n=0;
    i=strlen(s)-1;
    while (i>=0)
    {
      if (s[i]=='V')
      {
        t[n]=1;
        a[n]=0;
        b[n++]=1;
      } else
      if (s[i]=='U')
      { 
        n--;
        t[n-1]+=t[n];
        if (a[n]>a[n-1]) a[n-1]=a[n];
        b[n-1]+=b[n];
        if (b[n]==0 || b[n-1]==b[n]) b[n-1]++;
      } else
      if (s[i]=='C') 
      { if (t[n-1]>1)
      {
        r1=a[n-1];
        a[n-1]=b[n-1];
        b[n-1]=r1;
      }
      }
      i--;
    }
    if (t[0]<2) printf("0\n"); else 
    printf("%lld\n",b[0]);
  }



  return 0;
}