a=input()
b=a.lower()
c=[i for i in b]
for i in c:
    if i==" ":
        c.remove(" ")
for i in c:
    if c.count(i)==1:
        print(i,end=" ")

52b99f20f833b4985a05165248608f374de1cb42
<mask token>

<mask token>
for i in c:
    if i == ' ':
        c.remove(' ')
for i in c:
    if c.count(i) == 1:
        print(i, end=' ')

a = input()
b = a.lower()
c = [i for i in b]
for i in c:
    if i == ' ':
        c.remove(' ')
for i in c:
    if c.count(i) == 1:
        print(i, end=' ')

a=input()
b=a.lower()
c=[i for i in b]
for i in c:
    if i==" ":
        c.remove(" ")
for i in c:
    if c.count(i)==1:
        print(i,end=" ")
