my boring python solution:

from pathlib import Path


def main():
    input = Path('input.txt').read_text().split('\n')
    names = input[0].split(',')
    instructions = input[-1].split(',')
    print(names,instructions)
    index = 0
    for instruction in instructions:
        dir = instruction[0]
        number = int(instruction[1:])
        if dir == 'L':
            index -= number
            if index < 0:
                index = 0
        else:
            index += number
            if index > len(names) - 1:
                index = len(names) - 1
    print(names[index])
    index = 0
    for instruction in instructions:
        dir = instruction[0]
        number = int(instruction[1:])
        if dir == 'L':
            index -= number
        else:
            index += number
    print(names[index%(len(names))])
    indexes = list(range(len(names)))
    for instruction in instructions:
        dir = instruction[0]
        number = (int(instruction[1:]) if dir == 'R' else -int(instruction[1:])) % len(names)
        indexes[0], indexes[number] = indexes[number], indexes[0]
    print(names[indexes[0]])

if __name__ == "__main__":
    main()

I probably should read all 3 files though. I'll hone it out later.