There were 35 people on the bus. At this stop, 18 people got off and 15 got on. How many fewer people are on the bus now than at the beginning?
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))