FirstStudentFirstGroup = input().split()
SecondStudentFirstGroup = input().split()
FirstStudentSecondGroup = input().split()
SecondStudentSecondGroup = input().split()

FirstStudentFirstGroup.sort()
FirstStudentSecondGroup.sort()
SecondStudentFirstGroup.sort()
SecondStudentSecondGroup.sort()

d = {}

for i in range(max(len(FirstStudentFirstGroup), len(SecondStudentFirstGroup))):
    if i < len(FirstStudentFirstGroup) and i < len(SecondStudentFirstGroup):
        if FirstStudentFirstGroup[i] == SecondStudentFirstGroup[i]:
            d[FirstStudentFirstGroup[i]] = 1

for i in range(max(len(FirstStudentSecondGroup), len(SecondStudentSecondGroup))):
    if i < len(FirstStudentSecondGroup) and i < len(SecondStudentSecondGroup):
        if FirstStudentSecondGroup[i] == SecondStudentSecondGroup[i]:
            d[FirstStudentSecondGroup[i]] = 1

print(list(d.keys()))