Simple program In java

somefile.java

import java.io.*;
class Nekofuri
{
  public static void main(String[] args)throws IOException
  {
    String str;
    BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
    str=br.readLine();
    char[] A=str.toCharArray();
    char B[]=new char[A.length];
    int ctr=1;
    char x=A[0];
    int i,k=0;
    for(i=1;i<A.length;i++)
    {
      if(x==A[i])
      {
        ctr++;
     }
      else if(ctr>=1)
      {
        if(ctr%2==1)
        {
          B[k++]=x;
        }
        ctr=1;
        x=A[i];
      }
    }
    if(ctr%2==1)
    {
      B[k++]=x;
    }
System.out.println(B);
  }
}