def valid(person, task):
for taskCheck in person:
if task[0] in range(taskCheck[0], taskCheck[1]) or task[1] in
range(taskCheck[0], taskCheck[1]):
return False
return True
def fun():
jamie = []
cameron = []
ans = ''
taskCount = int(input())
for i in range(taskCount):
lst = (list(map(int, input().split(" "))))
if valid(cameron, lst):
cameron.append(lst)
ans += 'C'
elif valid(jamie, lst):
ans += 'J'
jamie.append(lst)
else:
ans = "IMPOSSIBLE"
break
return ans
n = int(input())
anslst = []
for i in range(n):
anslst.append(fun())
j = 1
for i in anslst:
print("Case #" + str(j) + ": ", end="")
print(i)
j += 1
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