ACM-ICPC 2018 沈阳赛区网络预赛 K. Supreme Number

Posted 2021-01-04 tingtin

A prime number (or a prime) is a natural number greater than 11 that cannot be formed by multiplying two smaller natural numbers.

Now lets define a number NN as the supreme number if and only if each number made up of an non-empty subsequence of all the numeric digits of NN must be either a prime number or 11.

For example, 1717 is a supreme number because 11, 77, 1717 are all prime numbers or 11, and 1919 is not, because 99 is not a prime number.

Now you are given an integer N (2 leq N leq 10^{100})N (2≤N≤10100), could you find the maximal supreme number that does not exceed NN?

Input

In the first line, there is an integer T (T leq 100000)T (T≤100000) indicating the numbers of test cases.

In the following TT lines, there is an integer N (2 leq N leq 10^{100})N (2≤N≤10100).

Output

For each test case print "Case #x: y", in which xx is the order number of the test case and yy is the answer.

样例输入复制

2
6
100

样例输出复制

Case #1: 5
Case #2: 73

题目来源

ACM-ICPC 2018 沈阳赛区网络预赛

 

一个数包含他的子串都不会是素数

[1,2,3,5,7,11,13,17,23,31,37,53,71,73,113,131,137, 173,311,313,317,373,1373,3137]

 一个数包含他的子序列都不会是素数

 

1,2,3,5,7,11,13,17,23,31,37,53,71,73,113,131,137,173,311,317,