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lower = ['a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z']
upper = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
while True:
key = abs(int(input("Type a key (0 - 26): ")))
while key > 26:
key -= 26
msg = input("Type a message: ")
decoded = [] ; encoded = []
for c in msg:
try:
decoded.append(lower[lower.index(c) - key])
encoded.append(lower[lower.index(c) + key])
except:
try:
decoded.append(upper[upper.index(c) - key])
encoded.append(upper[upper.index(c) + key])
except:
decoded.append(c)
encoded.append(c)
print(end="Decoded message: ")
for c in decoded:
print(end=c)
print()
print(end="Encoded message: ")
for c in encoded:
print(end=c)
print("\n")
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