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Codeforces-Dubstep solution 

#include<bits/stdc++.h>
using namespace std;
int main()
{
 string str;
 getline(cin,str);
 int index=str.find("WUB");
 int count=0;
 while(index!=-1)
 {
  
  str.replace(index,3," ");
  //str.erase(str.begin()+index,str.begin()+index+3);
  index=str.find("WUB");
 }
 cout<<str;
 return 0;
}

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