There were 35 people on the subway, 18 got off and 15 got on. Find out the number of passengers decreased in the subway.
35 35 18 [OP_SUB] 15 [OP_ADD] [OP_SUB]
var_a = 35
var_b = 35
var_c = 18
var_d = var_b - var_c
var_e = 15
var_f = var_d + var_e
var_g = var_a - var_f
print(int(var_g))