y = input().split() a = y[0] b = y[1] c = y[2] d = y[3] if a == "z": print("a",end=" ") else: print(chr(ord(a)+1),end=" ") if b == "z": print("a",end=" ") else: print(chr(ord(b)+1),end=" ") if c == "z": print("a",end=" ") else: print(chr(ord(c)+1),end=" ") if d == "z": print("a",end=" ") else: print(chr(ord(d)+1),end=" ")