with open("06.txt") as f:
  data = f.read()
ex_data = "mjqjpqmgbljsphdztnvjfqwrcgsmlb"
ex2_data = "bvwbjplbgvbhsrlpgdmjqwftvncz"

def solve(data, marker_len = 4):
  for i in range(marker_len - 1, len(data)):
    last4 = data[i-marker_len:i]
    if len(set(last4)) == marker_len:
      print(i)
      break

solve(ex_data)
solve(ex2_data)
solve(data)

solve(ex_data, marker_len = 14)
solve(ex2_data, marker_len = 14)
solve(data, marker_len = 14)