n = sorted(list(input().rstrip())) c = 0 x = "" if len(n) == 2: if n[0] != n[1]: print("I'm Sorry Hansoo") quit() i = 0 l = len(n) while i 1: print("I'm Sorry Hansoo") quit() i += 1 for _ in n[::2] + [x] + n[::-2]: print(_, end="")
C