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, 4, ['6969', 'P', '8161', '6347', 'P', 'S', 'z']

SOLUTION: 74361618P9696

PROBLEM: 1, 7, ['P', 'h', '1443', 'b', 'K', '2641', '3831']

SOLUTION: 13831462Kb3441hP

PROBLEM: 7, 22, ['3371', '4741', 's', '7429', 'z', '639', 'Q', '5679', 'e', '8039', '5323', 'C', '2901', '7629', 'D', 'y', 'C', '4333', 'P', 'v', 'A', '8171']

SOLUTION:
1718AvP3334CyD92671092C32359308e9765Q