#!/usr/bin/python3
def ceasar_shift_char(char, n):
    if 'A' <= char <= 'Z':
        return chr((ord(char)-ord('A') + n)%26 +ord('A'))
    elif 'a' <= char <= 'z':
        return chr((ord(char)-ord('a') +n)%26 +ord('a'))
    elif 'Α' <= char <= 'Ω':
        return chr((ord(char)-ord('Α')+n)%24 + ord('Α'))
    elif 'α' <= char <= 'ω':
        return chr((ord(char)-ord('α')+n)%24 + ord('α'))
    elif '0' <= char <= '9':
        return chr((ord(char)-ord('0')+n)%10 + ord('0'))
    else:
        return char
def ceasar_cipher(text,n):
    return ''.join(ceasar_shift_char(c,n) for c in text)
def ceasar_decipher(text,n):
    return ceasar_cipher(text,-n)
def main():
    example_text="Καλημέρα Hello"
    encoded_text=ceasar_cipher(example_text,3)
    print (encoded_text)
    decoded_text=ceasar_decipher(encoded_text,3)
    print (decoded_text)
if __name__=="__main__":
    main()