You are given three positive integers num1, num2, and num3.
The key of num1, num2, and num3 is defined as a four-digit number such that:
ith digit (1 <= i <= 4) of the key is generated by taking the smallest digit among the ith digits of num1, num2, and num3.Return the key of the three numbers without leading zeros (if any).
\n
Example 1:
\n\nInput: num1 = 1, num2 = 10, num3 = 1000
\n\nOutput: 0
\n\nExplanation:
\n\nOn padding, num1 becomes "0001", num2 becomes "0010", and num3 remains "1000".
1st digit of the key is min(0, 0, 1).2nd digit of the key is min(0, 0, 0).3rd digit of the key is min(0, 1, 0).4th digit of the key is min(1, 0, 0).Hence, the key is "0000", i.e. 0.
Example 2:
\n\nInput: num1 = 987, num2 = 879, num3 = 798
\n\nOutput: 777
\nExample 3:
\n\nInput: num1 = 1, num2 = 2, num3 = 3
\n\nOutput: 1
\n\n
Constraints:
\n\n1 <= num1, num2, num3 <= 9999给你三个 正 整数 num1 ，num2 和 num3 。
数字 num1 ，num2 和 num3 的数字答案 key 是一个四位数，定义如下：
key 的第 i 个数位（1 <= i <= 4）为 num1 ，num2 和 num3 第 i 个数位中的 最小 值。请你返回三个数字 没有 前导 0 的数字答案。
\n\n\n\n
示例 1：
\n\n输入：num1 = 1, num2 = 10, num3 = 1000
\n\n输出：0
\n\n解释：
\n\n补前导 0 后，num1 变为 \"0001\" ，num2 变为 \"0010\" ，num3 保持不变，为 \"1000\" 。
key 的第 1 个数位为 min(0, 0, 1) 。key 的第 2 个数位为 min(0, 0, 0) 。key 的第 3 个数位为 min(0, 1, 0) 。key 的第 4 个数位为 min(1, 0, 0) 。所以数字答案为 \"0000\" ，也就是 0 。
示例 2：
\n\n输入： num1 = 987, num2 = 879, num3 = 798
\n\n输出：777
\n示例 3：
\n\n输入：num1 = 1, num2 = 2, num3 = 3
\n\n输出：1
\n\n\n
提示：
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