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: 3, 6, ['643', 'X', 'F', '7453', '8495', '7943']

SOLUTION: 349759483547F

PROBLEM: 3, 13, ['9827', '3335', 'K', 'p', '7941', 'U', '4513', 'l', 'B', '179', '9825', '5437', 'u', '7853', '8907', 't', 'V', 'U', 'K', '7159', '6077', 'n']

SOLUTION: u73455289971Bl3154U1497pK

PROBLEM: 5, 17, ['B', 'a', '6011', 'l', '1755', '5529', 'V', 'n', 'Q', '2973', 'x', 'E', 'N', 'Z', '5717', 'U', 'j', 'n', '3783']

SOLUTION:
jU7175ZNEx3792QnV92555571

