TASK DEFINITION: In this task, you are given inputs 'i', 'j', and A, where 'i' and 'j' are integers and A is a list. A list is shown by two brackets and comma-separated numbers and characters inside, like ['1', '12', 'l']. You need to concatenate all elements of A from the ith element to the jth element, and then reverse the resulting string. 'i' and 'j' will be non-negative, and will always have a value less than the length of A. 'i' will always be less than 'j'. Perform the operations in order, i.e., do not reverse first and then concatenate.
PROBLEM: 3, 21, ['V', '3661', '3743', 'Y', '3179', 'b', '7097', '3031', '5859', '4095', 'D', 'J', '2337', '4259', '2539', 'I', '9659', 'U', 'G', 'Q', '3145', '177', '9839', 'f']

SOLUTION: 5413QGU9569I935295247332JD5904958513037907b9713Y3473

PROBLEM: 1, 3, ['2217', 'i', '6309', '6299', 'z']

SOLUTION: 9036i7122

PROBLEM: 12, 24, ['43', 'n', 'Q', '3207', 'u', '9737', '4755', '7979', 'k', '3731', 's', 'Z', '8019', '4067', '8975', '1421', '4251', '309', '8081', 'p', 'k', '4447', '4039', 'A', 'U']

SOLUTION:
A93047444kp180890315241241579876049108Z