There were 25 cars in the parking lot. After 18 cars went out, another 12 came in. How many cars fell in number in the parking lot?
25 25 18 [OP_SUB] 12 [OP_ADD] [OP_SUB]
var_a = 25
var_b = 25
var_c = 18
var_d = var_b - var_c
var_e = 12
var_f = var_d + var_e
var_g = var_a - var_f
print(int(var_g))