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

#define MAX 250000

#define IS 0
#define W  1

int stk[MAX][2];
int top=0;
char line[MAX];

int main(void) {
  while(fgets(line,MAX,stdin)) {
    for (int index=strlen(line)-1;index>=0;index--) {
      int c=line[index];
      if (isupper(c)) {
	switch(c) {
	  case 'V':
	  stk[top][IS]=1;
	  stk[top][W]=1;
	  top++;
	  break;
	  case 'U':
	  stk[top-2][IS]+=stk[top-1][IS];
	  if (stk[top-1][W] > stk[top-2][W]) stk[top-2][W]=stk[top-1][W];
	  top--;
	  break;
	  case 'C':
	  int tmp=stk[top-1][W];
	  stk[top-1][W]=stk[top-1][IS];
	  stk[top-1][IS]=tmp;
	  break;
	}
      }
    }
    printf("%d\n", stk[top-1][IS]);
    top=0;
  }

  return 0;
}