s = list(input())
new_s = []
for i in s:
if i not in new_s:
new_s.append(i)
print("".join((lambda x: (x.sort(), x)[1])(list(new_s))))
s = list(input())
new_s = []
for i in s:
if i not in new_s:
new_s.append(i)
print("".join((lambda x: (x.sort(), x)[1])(list(new_s))))