Type in the code below. Describe what is happening to the variables a and b$.$

#$-------$ Main Function $----------------------$

def main$()$:

a $=3$

b $=7$

function$1($a$)$

print$("$After call to function$1,$ A is: $",$ a$)$

b $=$ function$2($b$)$

print$("$After call to function$2,$ B is: $",$ b$)$

#$--------$ Custom functions below$--------------$

def function$1($a$)$:

print$("$A is: $",$a$)$

a $=$ a $+2$

print$("$A is now: $",$ a$)$

a $=$ a $+5$

def function$2($b$)$:

print$("$B is: $",$b$)$

b $=$ b $*4$

print$("$B is now: $",$ b$)$

return$($b$)$

main$()$ #this line needed at the bottom