#include <stdio.h>

char s0[1000001]={0};
char s1[1000001]={0};
char s2[1000001]={0};

void main()
{
  int j=0;
  int n1=0,n2=0;
  scanf("%s",s0);
  while(s0[j]!=0)
  {
    if (s0[j]!='L' && s0[j]!='R')
      s1[n1++]=s0[j];
    else
    {
      if (s0[j]=='L' && n1!=0) s2[n2++]=s1[--n1];
      if (s0[j]=='R' && n2!=0) s1[n1++]=s2[--n2];
    }
    j++;
  }

  for(int i=n2-1;i>=0;i--) s1[n1++]=s2[i];
  printf("%s",s1);
}