def f(s):
	bs = s.encode()
	ba = bytearray()
	for b in bs: ba.append(ord(b'*') if b in range(ord('0'), ord('9')) else b)
	return bytes(ba).decode()

def main():
	#ro = open("masking.in", "r")
	#wo = open("masking.out", "w")
	#s = ro.read()
	
	s = "abcd123 zxcv55 1q2w3e4r!@#$"
	result = f(s)
	print(result)
	
	#ro.close()
	#wo.close()

if __name__ == "__main__":
	main()