blob: b081a038b665b21e97bbf7bbc16550185777e67c (
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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()
s.reverse()
p.append(s.pop())
res = 'NO'
while s:
ss = reduce(xor, s)
sp = reduce(xor, p)
if ss == sp:
res = str(sum(s))
break
p.append(s.pop())
s = "Case #%d: %s\n" % (t+1, res)
#print s
o.write(s)
f.close()
o.close()
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