A = list(map(int, input().split(' ')))

Y = sorted(A)
  
K = [0,1,2,3]

if A[0] == A[1] == A[2]:
    print(A[0])
elif Y[0] != Y[1] != Y[2]:
    K.remove(Y[0])
    K.remove(Y[1])
    K.remove(Y[2])
    print(*K)
else:
    if Y[0] == Y[1]:
        print(Y[2])
    else:
        print(Y[0])