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: 2, 10, ['1183', '2299', 'O', '963', 'E', '9319', 'L', 'R', '1293', '8707', 'n', 'D', '6721', '2219', '3293', 'J', '4673', '325', '285', '5331']

SOLUTION: 70783921RL9139E369O9922

PROBLEM: 1, 3, ['r', '5153', 'I']

SOLUTION: I3515r

PROBLEM: 13, 14, ['a', 'h', '943', 'f', 'g', 'f', '1443', 'a', '9197', '6773', '6753', 'f', '417', 'L', '8355', '8519', '899']

SOLUTION:
L714