T = int(raw_input())
for i in range(T):
a, b = map(int, raw_input().split(' '))
print("Case {0} : {1}".format(i+1, a+b))
VCA9IGludChyYXdfaW5wdXQoKSkKZm9yIGkgaW4gcmFuZ2UoVCk6CiAgICBhLCBiID0gbWFwKGludCwgcmF3X2lucHV0KCkuc3BsaXQoJyAnKSkKICAgIHByaW50KCJDYXNlIHswfSA6IHsxfSIuZm9ybWF0KGkrMSwgYStiKSk=