Nine students are standing in a line at the bus stop waiting for the bus. How many students are between the second student from the back and the third student from the front?
9 3 [OP_SUB] 2 [OP_SUB]
var_a = 9
var_b = 3
var_c = var_a - var_b
var_d = 2
var_e = var_c - var_d
print(int(var_e))