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, 7, ['4177', 'T', 'Q', '915', '7823', 'm', '6453']

SOLUTION: 3546m3287519QT7714

PROBLEM: 3, 3, ['x', 'v', 'p', '4337', '635', '8927', 'B']

SOLUTION: p

PROBLEM: 20, 22, ['o', '5309', '8471', 'R', '9329', 'b', 'i', '2375', '3715', '709', '9881', 'G', '6289', '7475', '8445', 'L', 'n', 'a', '2845', '9339', '2515', '2285', '6685', '3383', '5145', '4605', 'B']

SOLUTION:
582251529339