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: 9, 16, ['E', 'M', '361', '4657', '8215', '8495', '73', 'O', '1949', '8617', '7963', 'B', '4393', 'b', '5085', '1535', 'A', 't', '4831', 'v', '9665', 'Z', '7017', '4449', 'Z', 'd', 'Q', '3879', 'J', 'y']

SOLUTION: 53515805b3934B369771689491

PROBLEM: 4, 4, ['339', '1345', '9749', '6877', 'b', 'K', 'f', '1443']

SOLUTION: 7786

PROBLEM: 6, 10, ['5493', 'N', '9943', 'S', '5415', '2901', 'r', 'J', '4279', '7699', '2401', 'w', '4515', '5673', '2689', 'z', '1039', '7157', '711', '9369', 'm', '1941', 'P', '5571', '6063', 'r']

SOLUTION:
99679724Jr1092