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

SOLUTION: 9036i7122

PROBLEM: 3, 5, ['C', '4345', 'T', 't', 'U', 'p']

SOLUTION: UtT

PROBLEM: 15, 17, ['j', '7083', '6819', '2231', 'i', '2453', 'l', 'L', 'X', 'p', '8713', '2143', '2351', 'e', '9367', 'q', '6727', '7381', '1663', '2209', 'p', 'k', '573', '9387', 'U', '6047', '7717', '4783']

SOLUTION:
7276q7639