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: 7, 10, ['417', '8131', '7239', '9699', 'z', 'H', 'P', '9349', '4835', '3217', '9899']

SOLUTION: 712353849439P

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

SOLUTION: D787776525772

PROBLEM: 8, 11, ['2169', 'D', 'l', '8717', 'P', 'v', '7953', '7757', 'c', '8955', 'k', '2179', '8433', '1785', '517', 'g', 'l']

SOLUTION:
k5598c7577