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def dencrypt(s, n):

out = ''

for c in s:

if c >= 'A' and c <= 'Z':

out += chr(ord('A') + (ord(c) - ord('A') + n) % 26)

elif c >= 'a' and c <= 'z':

out += chr(ord('a') + (ord(c) - ord('a') + n) % 26)

else:

out += c

return out

def main():

s0 = 'HELLO'

s1 = dencrypt(s0, 13)

print(s1) # URYYB

s2 = dencrypt(s1, 13)

print(s2) # HELLO

if __name__ == '__main__':

main()