/* yuki346.c */
#include <stdio.h>
#include <string.h>

int main(){
  char s[9999] = {'\0'};
  int i = 0;
  int w = 0;
  int sum = 0;

  scanf("%s", s);

  for(i = strlen(s) - 1; i >= 0; i--){
    if(s[i] == 'w'){
      w++;
    }
    if(s[i] == 'c'){
      sum += w * (w - 1) / 2;
    }
  }

  printf("%d\n", sum);
}