Decode the Mad man

arr=list("qwertyuiop[]asdfghjkl;'zxcvbnm,./")
while 1:
	try:
		a=list(input())
		for i in range(len(a)):
			a[i]=a[i].lower()
			for j in range(len(arr)):
				if a[i]==arr[j]:
					a[i]=arr[j-2]
		for i in a:
			print(i,end="")
		print()
	except:
		break

Common Permutation

while 1:
	try:
		a=list(input())
		b=list(input())
		a=sorted(a)
		ans=[]
		for i in a:
			if i in b and i!=' ':
				ans.append(i)
				b.remove(i)
		for i in ans:
			print(i,end="")
		print()
	except:
		break