3.11-3.13 PAT1029 乙级 python

旧键盘

def quchong(a):
	lst = []
	for i in list(a):
		if i not in lst:
			lst.append(i)
	return lst
ipt = quchong(input())
otpt = quchong(input())
inpt = ipt
for i in otpt:
	if i in ipt:
		inpt.remove(i)
k = ''.join(inpt)
k = quchong(k.upper())
print(''.join(k))