#switch from ben to charlie
def ben_to_charlie(ben_sequence):
  charlie_sequence = []
  print(ben_sequence)
  loops = len(ben_sequence)
  charlie_sequence.append(ben_sequence[0])
  for i in range (1, loops):
    thing1 = (charlie_sequence[i-1])
    thing2 = (ben_sequence[i])
    charlie_sequence.append(thing1 + thing2)

  print("charlie's sequence is\n", charlie_sequence)

#switch from charlie to ben
def charlie_to_ben(charlie_sequence):
  ben_sequence =[]
  print(charlie_sequence)
  loops = len(charlie_sequence)
  ben_sequence.append(charlie_sequence[0])
  for i in range (1, loops):
    thing1 = charlie_sequence[i]
    thing2 = charlie_sequence[i-1]
    ben_sequence.append(thing1 - thing2)
  print("ben's sequence is", ben_sequence)

#input and store their sequence as an array
sequence_length = int(input("how long is your sequence? "))
their_sequence = []
for i in range (sequence_length):
  their_input = int(input("input sequence "))
  their_sequence.append(their_input)


#choose which function to run on sed array
switch = int(input(" Do want to change this sequence from \n (1) ben --> charlie / ana --> ben \n or \n (2), charlie-->ben / ben-->ana \n"))
if switch == 1:
  ben_to_charlie(their_sequence)
elif switch == 2:
  charlie_to_ben(their_sequence)
else:
  print("invalid response")