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: 2, 5, ['l', 'E', '729', 'U', 'z', '9729', '3247']

SOLUTION: zU927E

PROBLEM: 2, 3, ['2661', 'T', '8855', 'I', 'f', 'P']

SOLUTION: 5588T

PROBLEM: 4, 5, ['Z', 'z', '3911', 'd', '1999', '9895', 't', '2027', '5087', 'I', '2435', '3817']

SOLUTION:
9991d