AtCoder Beginner Contest 079
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Problem Statement
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Sitting in a station waiting room, Joisino is gazing at her train ticket.
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The ticket is numbered with four digits $A$, $B$, $C$ and $D$ in this order, each between $0$ and $9$ (inclusive).
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In the formula $A$ $op1$ $B$ $op2$ $C$ $op3$ $D$ $=$ $7$, replace each of the symbols $op1$, $op2$ and $op3$ with + or - so that the formula holds.
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The given input guarantees that there is a solution. If there are multiple solutions, any of them will be accepted.
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Constraints
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$0≤A,B,C,D≤9$- All input values are integers.
- It is guaranteed that there is a solution.
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Input
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Input is given from Standard Input in the following format:
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ABCD
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Output
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Print the formula you made, including the part =7.
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Use the signs + and -.
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Do not print a space between a digit and a sign.
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样例
Input #1
1222
Output #1
1+2+2+2=7
This is the only valid solution.
Input #2
0290
Output #2
0-2+9+0=7
$0 - 2 + 9 - 0 = 7$ is also a valid solution.
Input #3
3242
Output #3
3+2+4-2=7
题目信息
题面与样例版权归 AtCoder 及出题人所有;中文翻译由 AI 生成(CI 管线),如有出入请以原文为准。