Three fish caught by a fisherman were weighed. The mackerel was heavier than the flatfish, and the rockfish was heavier than the mackerel. How lightest is the rockfish among those three?
[OP_LIST_SOL] flatfish mackerel rockfish [OP_LIST_EOL] rockfish [OP_LIST_INDEX]
var_a = 'flatfish'
var_b = 'mackerel'
var_c = 'rockfish'
list_a= []
if "/" in str(var_c):
    var_c = eval(str(var_c))
list_a.append(var_c)
if "/" in str(var_b):
    var_b = eval(str(var_b))
list_a.append(var_b)
if "/" in str(var_a):
    var_a = eval(str(var_a))
list_a.append(var_a)
list_a.reverse()
var_d = 'rockfish'
var_e = list_a.index(var_d)+1
print(int(var_e))