/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
public static void main(String[] args)
{
  permSub("abc", "");
}
 
static void permSub(String s, String pre)
{    
  System.out.println(pre);    
  if(s.isEmpty()) return;
  for(int i=0; i<s.length(); i++)
    permSub(s.substring(0, i)+s.substring(i+1), pre+s.charAt(i));
}
}

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