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: 4, 12, ['I', 'G', 'u', 'S', '9615', 't', 'p', 'P', 'R', 'v', '8819', '5379', 'I', '1165', '4545', '3117', '1577', 'y', 'W', 'R', 'O']

SOLUTION: 97359188vRPpt5169S

PROBLEM: 1, 30, ['u', '2967', '8693', '6963', 'w', 'A', '1211', '2737', '3565', 'i', '3755', 'N', 'y', '7541', '685', '1191', '1837', '7215', '7191', '515', 'm', 'b', 'm', 'E', 'j', '5337', '7119', '599', '5097', '3399']

SOLUTION: 9933790599591177335jEmbm51519175127738119115861457yN5573i565373721121Aw369639687692u

PROBLEM: 9, 25, ['u', 'b', '4819', 'm', 'm', '1651', 'H', 'O', '481', 'I', 'g', '8861', 'b', '2641', 'D', '5411', '7731', 'I', '257', 'I', '2055', '5441', '7079', 'D', '93', '6783']

SOLUTION:
39D970714455502I752I13771145D1462b1688gI184