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Caesar Cipher hacker rank solution

def caesarCipher(s, k):
    string="abcdefghijklmnopqrstuvwxyz"*k
    newstring=string.upper()
    emtstring=""
    for i in s:
        if i in string:
            index=string.index(i)+k
            emtstring+=string[index]
        elif i in newstring:
            index=newstring.index(i)+k
            emtstring+=newstring[index]
        else:
            emtstring+=i
    return emtstring
print(caesarCipher("middle-Outz",2))
#okffng-Qwvb

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