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, 5, ['C', '4345', 'T', 't', 'U', 'p']

SOLUTION: UtT

PROBLEM: 1, 2, ['S', '7763']

SOLUTION: 3677S

PROBLEM: 11, 15, ['8867', '1571', 'q', 'j', '1333', 'H', '7291', 'E', 'Z', '7075', '1327', '1185', 'T', 'a', 'B', '8717', 't', 'N', 'Y', 'V', '8307', 'A', '687', 'a', 's', '2339', '1029', '1797', 'z']

SOLUTION:
BaT58117231