$$\left. \begin{array} { l } { 5 ^ { 0 } + 6 ^ { 0 } - 7 ^ { 0 } } \\ { - 9 ^ { 0 } } \end{array} \right.$$
$-1,1$
$$sort(1+6^{0}-7^{0},-9^{0})$$
$$sort(1+1-7^{0},-9^{0})$$
$$sort(2-7^{0},-9^{0})$$
$$sort(2-1,-9^{0})$$
$$sort(1,-9^{0})$$
$$sort(1,-1)$$
$$1$$
$$-1,1$$
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$1,\ -1$
