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: 11, 12, ['n', '8991', 'Z', '4113', '1623', '1351', 'l', 'p', 'T', '9931', '11', 'i', '1775', 'h', '7237', '8553', 'Q', 'U', '5395', '8727']

SOLUTION: i11

PROBLEM: 2, 5, ['1987', '3507', '839', '3509', '9857', 'V', '9987', 'g', 'G', '7295', 'v', 'b', 'o', 'Q', 'Q', 'x', '3295', '9917', 'R', '221']

SOLUTION: 758990539387053

PROBLEM: 3, 6, ['Q', '3825', 'j', '2267', '4109', '417', 'y', '2679', 'w', '1751', 'S', '3217', '2209', 'p', '7659']

SOLUTION:
71490147622j