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, ['7635', 'c', 'h', 'D', 'K', '7235', 'e']

SOLUTION: hc5367

PROBLEM: 5, 6, ['u', 'O', 'l', '9119', 'P', '6983', 'H', '6701']

SOLUTION: 3896P

PROBLEM: 10, 12, ['3951', '6611', 't', '6875', '7569', 's', 'f', '8615', 'P', '1649', '5753', '5817']

SOLUTION:
718535759461