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, 2, ['3909', '5863', '707']

SOLUTION: 36859093

PROBLEM: 2, 3, ['N', 'U', 'D', 'm', '9001', 'I', '2675', 'l', '2771', 'U', '1181', 'U']

SOLUTION: DU

PROBLEM: 2, 7, ['P', 'Q', 'i', '1593', 'M', '8577', 'd', 'Y']

SOLUTION:
d7758M3951iQ