P9193 [USACO23OPEN] Good Bitstrings P

For any two positive integers $a$ and $b$, define the function `gen_string(a,b)` by the following Python code: ``` def gen_string(a: int, b: int): res = "" ia, ib = 0, 0 while ia + ib < a + b: if ia * b

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Input $2$: $A,B\le100$;\ Input $3$: $A,B\le1000$;\ Inputs $4-7$: $A,B\le10^6$;\ Inputs $8-13$: All answers are at most $10^5$.\ Inputs $14-21$: No additional constraints.