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, 1, ['T', 'Y']

SOLUTION: T

PROBLEM: 3, 6, ['p', 'H', '2775', '2567', '7787', 'D', '3807', '4817', '5399']

SOLUTION: D787776525772

PROBLEM: 1, 12, ['l', 'r', 'U', 'E', 's', '7057', '8519', 'q', 't', '4943', 'j', 'z']

SOLUTION:
zj3494tq91587507sEUrl