Nine students stand in a line. How many students are standing between the 3rd from the left and the 7th from the left?
7 3 [OP_SUB] 1 [OP_SUB]
var_a = 7
var_b = 3
var_c = var_a - var_b
var_d = 1
var_e = var_c - var_d
print(int(var_e))