Problem Description

Xiao Lan wants to use $N$ digits $2$ and $M$ digits $3$ to form an integer with $N + M$ digits. Please compute the largest multiple of $2023$ that Xiao Lan can form.

Input Format

Two integers $N$ and $M$.

Output Format

An integer with $N + M$ digits, representing the answer. If it is impossible to form a multiple of $2023$, output $-1$.

2 8

2233333333

Hint

Constraints

• For $20\%$ of the testdata, $1 \le N, M \le 12$.
• For $40\%$ of the testdata, $1 \le N, M \le 100$.
• For $60\%$ of the testdata, $1 \le N, M \le 10000$.
• For $100\%$ of the testdata, $1 \le N, M \le 1000000$.

Final Round of the 14th Lanqiao Cup Software Contest, C/C++ College Group B, Problem I.

Translated by ChatGPT 5