Шифр Цезаря (Сириус)

def CaesarCipherChar(c, k):
    if c.isalpha()==True:
        c=chr(ord(c)+k)
    return c 
def CaesarCipher(S,k):
    stroke=''
    for i in S:
        stroke+=CaesarCipherChar(i,k)
    return stroke
S=input()
print(CaesarCipher(S,3))

FIRST_SYM = 'a'
LAST_SYM = 'z'
FIRST_SYM_CAPS = 'A'
LAST_SYM_CAPS = 'Z'
def cifer(str, alph, shift):
    result = ''
    for sym in str:
        if (ord(sym) + shift in range(ord(FIRST_SYM), ord(LAST_SYM) + 1) and ord(sym) in range(ord(FIRST_SYM), ord(LAST_SYM) + 1)) or (ord(sym) + shift in range(ord(FIRST_SYM_CAPS), ord(LAST_SYM_CAPS) + 1) and ord(sym) in range(ord(FIRST_SYM_CAPS), ord(LAST_SYM_CAPS) + 1)):
            result += chr(ord(sym) + shift)
        elif ord(sym) in range(ord(FIRST_SYM), ord(LAST_SYM) + 1) or ord(sym) in range(ord(FIRST_SYM_CAPS), ord(LAST_SYM_CAPS) + 1):
            result += chr(ord(sym) + shift - alph)
        else:
            result += sym
    return result
def letter_in_string(str):
    count = 0
    for a in str: 
        if (a.isalpha()) == True: 
            count+=1
    return count 
input_str = input()
result = ''
for elem in input_str.split(' '):
    result += cifer(elem, 26, letter_in_string(elem))
    result += ' '
    
print(result)