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import sys
message = input('Enter message: ')
key = None
try:
key = int(input('Enter key (1-25, -1 - -25): '))
except ValueError:
print('Invalid key, must be an integer')
sys.exit(1)
if key < 0: key += 26
if not (1 <= key <= 25):
print('Invalid key, must be an integer with absolute value between 1 and 25, inclusive')
sys.exit(2)
marr = bytearray(message, 'ascii')
for i in range(len(marr)):
c = marr[i]
if 64 < c < 64 + 27:
c = ((c - 65) + key) % 26 + 65
elif 96 < c < 96 + 27:
c = ((c - 97) + key) % 26 + 97
marr[i] = c
print('Caesar cipher with k =', key, 'applied to the given message:')
print(str(marr, encoding='ascii'))
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