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: 10, 11, ['6929', 'l', '8541', 'L', '7495', '7707', '8839', '6687', 'L', '5125', 'd', 'F', '7', '4357', 'w', 'R', '2459', '9871', 'E', '299', '5967', 'T']

SOLUTION: d5215

PROBLEM: 7, 10, ['4843', 'p', 'I', '8757', '2967', '7461', 'c', '2639', 'p', '8895']

SOLUTION: 5988p9362c

PROBLEM: 1, 20, ['n', 'E', '4177', 'C', 'v', '9635', 'o', 'h', 'S', '2345', 'G', 'j', '3889', '1045', '9747', '8079', 'B', '7717', '5047', 'I', '2717']

SOLUTION:
I74057177B9708747954019883jG5432Sho5369vC7714En