/*
#include <cstring>
#include <iostream>
#include <vector>
#include <string>
#include <map>
#include <queue>
#include <algorithm>
#include <stack>
*/
#include <unistd.h>
#include <stdio.h>

char str[112345];

int main() {

  int len = read(0, str, sizeof(str));

  int dp[4] = {};
  dp[0] = 1;
  for(int i = 0; i < len; ++i) {
    if( str[i] == 'w' ) {
      dp[3] += dp[2];
      dp[2] += dp[1];
    }
    if( str[i] == 'c' ) {
      dp[1] += dp[0];
    }
  }

  printf("%d\n", dp[3]);
  
  return 0;
}