import string

def CaeserCipher(s, k):
    L =[]
    for i in range(0, len(s)): 
        if((ord(s[i]) >= ord("a") and ord(s[i]) <= ord("z"))): # check if it is small alphabets
            temp = ord(s[i]) - ord("a")   # store the difference between the ASCII of our alphabet and ASCII of 'a'. 
            x = (temp + k) % 26    #  compute cipher from Wikipedia formula
            x = x + ord("a")       #  add back ord("a"), which was subtracted initially
            L.append(chr(x))       #  add this to our list
        elif((ord(s[i]) >= ord("A") and ord(s[i]) <= ord("Z"))): # repeat above step for capital letters
            temp = ord(s[i]) - ord("A")
            x = (temp + k) % 26
            x = x + ord("A")
            L.append(chr(x))
        else:
            L.append(s[i]) # not alphabet, add to list
    return ''.join(L)       # generate our string, preserving the format of original string