string handling -- Dubstep

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                                http://codeforces.com/problemset/problem/208/A

                                     A. Dubstep

In this question , we have to remove all "WUB" from a given string.
Sample test(s)
input
WUBWUBABCWUB
output
ABC
input
WUBWEWUBAREWUBWUBTHEWUBCHAMPIONSWUBMYWUBFRIENDWUB
output
WE ARE THE CHAMPIONS MY FRIEND

#include<bits/stdc++.h>

using namespace std;

int main()
{
 string s,s1;
 cin>>s;
 s1="WUB";

 int i,j,k,l;

 l=s.length();

  k=s.find(s1);               /// "find()" returns the starting index of s1 in s

 while(k!=-1)
 {
    s.replace(k,3," ");      /// "replace()" function replace  the 3 letters starting from kth index to "  ";
    k=s.find(s1);
 }
 cout<<s<<endl;
return 0;
}

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