def replace_all(s, t, f): for i in s: print(t if i in f else i, end="") s = input() if 'A' in s: replace_all(s, 'A', 'BCDF') elif 'B' in s: replace_all(s, 'B', 'CDF') elif 'C' in s: replace_all(s, 'C', 'DF') else: print("A"*len(s))