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: 1, 3, ['9937', 'F', 'g', 'B', 'M', 'x', 'n', 'V', '4241', 'Z']

SOLUTION: gF7399

PROBLEM: 4, 5, ['3349', '9445', '703', 'k', '3191', '4473', 'K', '3417', '8305', '8781', 'K', 'v', 'O', 'Y', '4375', 'o']

SOLUTION: 1913k

PROBLEM: 2, 15, ['4141', 'l', 'D', '1181', '8919', 'L', 'g', 'x', '1031', '8465', '8391', 'D', '9205', 'Y', 'L']

SOLUTION:
LY5029D193856481301xgL91981811Dl