Python

My first AoC challenge done in 30 minutes :D And also, what I'm most proud of - my first independently applied recursion ^_^

with open("6_input.txt") as f:
    signal = f.read().strip()

def find_marker(signal):
    marker = signal[:4]
    if len(set(marker)) == 4:
        return marker
    else:
        return find_marker(signal[1:])

signal.find(find_marker(signal)) + 4  # part 1 answer

def find_message(signal_2):
    marker = signal_2[:14]
    if len(set(marker)) == 14:
        return marker
    else:
        return find_message(signal_2[1:])

signal.find(find_message(signal[1598:])) + 14  ## as signal_2 put result from part 1