main.py

def get_pos(pos, steps, right=True):
    # steps can be bigger than 100 use modulo to get remaining steps below 100
    steps = modulo(steps, 100)
    if (right == False):
        if (pos - steps < 0):
            pos = num_steps + pos - steps
            # 100 + 4 - 15 = 89
        else: 
            pos -= steps
    elif(right == True):
        if (pos + steps > 99):
            pos = (pos + steps) - num_steps
            # 15 + 89 - 100 = 4
        else:
            pos += steps
        # 89 + 15 - 100 = 4
    return pos

def modulo(a, b):
    return a - (a // b) * b

pos = 50
num_steps = 100
count_zero = 0

with open("input.txt") as f:
    for line in f:
        direction = line[0]
        steps = int(line[1:])
        pos = get_pos(pos, steps, right=(direction == "R"))
        print("Neue Position:", pos)
        if (pos == 0):
            count_zero += 1

print("Die Position war insgesamt", count_zero, "Mal bei 0.")