//correct output: 99 88 99 77 55 66 99 77 55 66

class C1 extends Object {
  nat foo(nat unused) {printNat(99);}
  nat bar(nat unused) {printNat(88);}
}
class C2 extends C1 {
  nat bar(nat unused) {printNat(77);}
}
class C3 extends C1 {
  nat bar(nat unused) {printNat(66);}
  nat foo(nat unused) {printNat(55);}
}
main {
  C1 c1;
  C2 c2;
  C3 c3;
  c1 = new C1();
  c2 = new C2();
  c3 = new C3(); 
  c1.foo(0);
  c1.bar(0);
  c2.foo(0);
  c2.bar(0);
  c3.foo(0);
  c3.bar(0);
  c1 = new C2();
  c1.foo(0);
  c1.bar(0);
  c1 = new C3();
  c1.foo(0);
  c1.bar(0);
}