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import java.lang.Math; // headers MUST be above the first class

// one class needs to have a main() method
public class HelloWorld
{
  static char[] C={'a', 'b', 'c'};
  static char[] R= {' ', ' ', ' '};
 
  static void combina (int m) {
    if (m==0) {
      System.out.println (R);
      return;
    }
    int i=0;
    while (i<C.length) {
      // tem combina
      //System.out.print (C[i]);
      R[m-1]=C[i];
      combina(m-1);
      i++;
    }
  }
 
  // arguments are passed using the text field below this editor
  public static void main(String[] args)
  {
    combina (3);
  }
}