When the bus carrying 32 passengers arrived at the bus stop, 13 passengers got off and 19 passengers got on. How many people are left on the bus?
32 19 [OP_ADD] 13 [OP_SUB]
var_a = 32
var_b = 19
var_c = var_a + var_b
var_d = 13
var_e = var_c - var_d
print(int(var_e))