func F(){};
func M(){};
F = func(n) { n > 0 ? (n - M(F(n-1))) : 1 };
M = func(n) { n > 0 ? (n - F(M(n-1))) : 0 };
[F, M].each { |seq|
(0..19).map {|i| seq.call(i)}.join(' ').say;
}