There were 78 people on the train. Of these, 27 got off and a few got on, making the total people in the train to 63. How many people got on the train?
63 27 [OP_ADD] 78 [OP_SUB]
var_a = 63
var_b = 27
var_c = var_a + var_b
var_d = 78
var_e = var_c - var_d
print(int(var_e))