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: 4, 11, ['H', 'E', 'l', '5011', 'R', '2693', '1081', '9825', '8503', '213', '2717', '8335', '3355', 'd', '7727', '3417', 'R', 'V', 'e']

SOLUTION: 71723123058528918013962R1105

PROBLEM: 4, 7, ['C', 'j', 'F', '495', 'H', '6595', 'h', '7567', 'f']

SOLUTION: h5956H594

PROBLEM: 1, 6, ['87', 'I', '583', 'U', '2155', '3625', '3685', '9867', '7569', 'L', 'I', 'x', '1599', 's', '8581', 'W', 'L', 'j', '811', '5671', 'N', 'T', '1939', 'o', 'H', 'x']

SOLUTION:
52635512U385I78