Array Manipulator

#!/usr/local/bin/python3.7
# -*- coding: utf-8 -*import


def check_even(c: list):
    evens = []
    for i in c:
        if i % 2 == 0:
            evens.append(i)
    return evens


def check_odd(d: list):
    odds = []
    for i in d:
        if i % 2 != 0:
            odds.append(i)
    return odds


def duplicate_val(f: list, g: int):
    seen = set()
    res = []
    for i, j in enumerate(f):
        if j == g and j not in seen:
            seen.add(j)
        else:
            if j == g:
                res.append(i)
    return max(res)


def array_manipulator(a: str, b: str):
    lst = [int(x) for x in a.split(' ')]
    while b != 'end':
        b = b.split(' ')
        if 'exchange' in b:
            idx = int(b[1])
            if len(lst) - 1 < idx or idx < 0:
                print('Invalid index')
            else:
                sub_lst_1 = lst[:idx + 1]
                sub_lst_2 = lst[idx + 1:]
                lst = sub_lst_2 + sub_lst_1
        elif 'max' in b:
            if 'even' in b:
                nums = check_even(lst)
                if nums:
                    max_min = max(nums)
                    if nums.count(max_min) < 2:
                        idx = lst.index(max_min)
                        print(idx)
                    else:
                        print(duplicate_val(lst, max_min))
                else:
                    print('No matches')
            elif 'odd' in b:
                nums = check_odd(lst)
                if nums:
                    max_min = max(nums)
                    if nums.count(max_min) < 2:
                        idx = lst.index(max_min)
                        print(idx)
                    else:
                        print(duplicate_val(lst, max_min))
                else:
                    print('No matches')
        elif 'min' in b:
            if 'even' in b:
                nums = check_even(lst)
                if nums:
                    max_min = min(nums)
                    if nums.count(max_min) < 2:
                        idx = lst.index(max_min)
                        print(idx)
                    else:
                        print(duplicate_val(lst, max_min))
                else:
                    print('No matches')
            elif 'odd' in b:
                nums = check_odd(lst)
                if nums:
                    max_min = min(nums)
                    if nums.count(max_min) < 2:
                        idx = lst.index(max_min)
                        print(idx)
                    else:
                        print(duplicate_val(lst, max_min))
                else:
                    print('No matches')
        elif 'first' in b:
            count = int(b[1])
            if count > len(lst):
                print('Invalid count')
            else:
                if 'even' in b:
                    nums = check_even(lst)
                    if not nums:
                        print(f'{nums}')
                    else:
                        if len(nums) >= count:
                            nums_found = nums[:count]
                            print(nums_found)
                        else:
                            print(nums)
                elif 'odd' in b:
                    nums = check_odd(lst)
                    if not nums:
                        print(f'{nums}')
                    else:
                        if len(nums) >= count:
                            nums_found = nums[:count]
                            print(nums_found)
                        else:
                            print(nums)
        elif 'last' in b:
            count = int(b[1])
            if count > len(lst):
                print('Invalid count')
            else:
                if 'even' in b:
                    nums = check_even(lst)
                    if not nums:
                        print(f'{nums}')
                    else:
                        if len(nums) >= count:
                            nums_found = nums[-count:]
                            print(nums_found)
                        else:
                            print(nums)
                elif 'odd' in b:
                    nums = check_odd(lst)
                    if not nums:
                        print(f'{nums}')
                    else:
                        if len(nums) >= count:
                            nums_found = nums[-count:]
                            print(nums_found)
                        else:
                            print(nums)
        b = input()
    else:
        print(lst)


array_manipulator(input(), input())