求两个大的正整数相减的差。
共2行,第1行是被减数aaa,第2行是减数bbb(a>ba > ba>b)。每个大整数不超过200200200位,不会有多余的前导零。
一行,即所求的差。
9999999999999999999999999999999999999 9999999999999
9999999999999999999999990000000000000
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