#36984: 不同的想法，只是不太適合考試(要快)
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2024-03-09 10:57:26
x, y, z = list(map(int, input().split()))
c = -1
is_possible = False
def logic(a, b, z, operation):
global c, is_possible
if operation == 'AND':
if a!=0 and b!=0:
c = 1
else:
c = 0
if c == z:
print('AND')
is_possible = True
if operation == 'OR':
if a==0 and b==0:
c = 0
else:
c = 1
if c == z:
print('OR')
is_possible = True
if operation == 'XOR':
if a==0 and b==0:
c = 0
elif a!=0 and b!=0:
c = 0
else:
c = 1
if c == z:
print('XOR')
is_possible = True
logic(x, y, z,'AND')
logic(x, y, z,'OR')
logic(x, y, z,'XOR')
if not is_possible:
print('IMPOSSIBLE')
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