blob: ccbc12fa40a92a8a972733d0c830c31749d413ca (
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f = open('3.in', 'r')
o = open('3.out', 'w')
T = int(f.readline().strip())
xor = lambda x,y: x^y
for t in xrange(T):
_n = f.readline().strip().split(' ')
C = map(int, f.readline().strip().split(' '))
s, p = C, []
s.sort()
p.append(s.pop(0))
res = 'NO'
while s:
ss = reduce(xor, s)
sp = reduce(xor, p)
if ss == sp:
res = str(sum(s))
break
p.append(s.pop(0))
s = "Case #%d: %s\n" % (t+1, res)
o.write(s)
f.close()
o.close()
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