TASK DEFINITION: In this task, you are given inputs i,j, and A, where i and j are integers and A is a list. You need to concatenate all elements of A from the ith element to the jth element, and print the resultant 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.
PROBLEM: 13, 14, ['r', '2521', '8819', '2173', 'U', 'I', 'G', '2499', 'c', '6667', 'K', '1187', '3605', '9115', '3905', '7135', '3173', 'F']

SOLUTION: 36059115

PROBLEM: 18, 18, ['H', '7555', '2635', 'l', 'Y', '6449', 'K', '31', 'A', 'h', 'x', 'G', '4519', 'B', '4221', 'k', 't', 'w', '4167', '5103', '9363', 'g']

SOLUTION: w

PROBLEM: 15, 20, ['D', '9187', 'l', 'r', '7655', 'T', 'A', 'O', 'w', 'O', 'G', '6103', 'h', 'S', 'N', '781', 'N', '2803', 'x', 'V', 'O', 'e', 'f']

SOLUTION:
N781N2803xV