Fill in the blanks for the environment diagram shown below when the following code is executed. Line numbers are included for convenience. Do NOT include spaces in your answers.

$1$ def foo$($seq$)$:

$2$ pos $=$ bar$($seq$)$

$3$ a $=$ seq$[$:pos$]$

$4$ b $=$ seq$[$pos$+1$:$]$

$5$ return a$+$b

$6$

$7$ def bar$($sub$)$:

$8$ return sub$[0]$

$9$

$10$ p $=[2,0,-1,4]$

$11$ p $=$ foo$($p$)$

$12$ print$($p$)$