C++ - TP za zadatak Graf

#### ulaz ###
16
a b
a c
a d
a e
a f
z b
z c
z d
z e
z f
a x
x y
y h
h w
w z
t r

4
a z
z a
t r
b c

#### izlaz ####
a -> b -> z
a -> c -> z
a -> d -> z
a -> e -> z
a -> f -> z

z -> b -> a
z -> c -> a
z -> d -> a
z -> e -> a
z -> f -> a

t -> r

b -> a -> c
b -> z -> c