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.

Ex Input:
2, 20, ['v', 'B', '2287', '1923', 'C', '8477', '4115', '803', '6579', 'u', 'x', 'b', 'J', '4007', '3505', 'M', 'g', 'Z', '2887', 'U', 'S', 'Y', 'i']

Ex Output:
B22871923C847741158036579uxbJ40073505MgZ2887U


Ex Input:
1, 2, ['f', '6835']

Ex Output:
f6835


Ex Input:
1, 2, ['M', 'B', '7173', 'T', '1543', '1661', 'K', 'R', 'K', 'M', '6693']

Ex Output:

MB