class Caesar:
    def __init__(self, key, s):
        self.key = key
        self.s = s
        self.l = len(self.s)

    def __iter__(self):
        self.c = 0
        return self

    def __next__(self):
        if self.c < self.l:
            res = chr((ord(self.s[self.c]) + self.key - 97) % 26 + 97)
            self.c += 1
            return res
        else:
            raise StopIteration


for i in Caesar(3, "hello"):
    print(i, end="")

# Coded by Saahil