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, 18, ['R', '7241', 'A', 'z', '8115', '6251', 'F', '1405', 'N', '3567', '1525', 'a', '6057', 'E', '5637', '4969', '3499', '5489', 'Z', 'K', 'M', 'I', 'Z', 'j']

SOLUTION: 9845994396947365E7506a52517653N5041F15265118zA

PROBLEM: 2, 9, ['g', '309', 'x', '3537', '5995', 'K', '6951', 'x', 'b', '3171', '9079', '7597']

SOLUTION: bx1596K59957353x903

PROBLEM: 6, 19, ['6051', 'R', 'w', 'F', 'k', 'C', '6747', 'b', '7929', 'i', 'j', 'p', 'o', '969', 'w', 'x', 'U', 'K', '2461', '585', 'n', 'I', 'm', '3031', 'W', 'T', 'o', 'z', '3455']

SOLUTION:
1642KUxw969opji9297b7476C