s=input()
s1=input()
s2=[i for i in s1]
a=[]
i1=0
for i in s:
if i !=s2[i1] and i.upper() not in a:
a.append(i.upper())
elif i==s2[i1] and i1!=len(s2)-1:
i1+=1
print(''.join(a))
s=input()
s1=input()
s2=[i for i in s1]
a=[]
i1=0
for i in s:
if i !=s2[i1] and i.upper() not in a:
a.append(i.upper())
elif i==s2[i1] and i1!=len(s2)-1:
i1+=1
print(''.join(a))
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