You are given a string array S; that contains the names of some files along with their

versions. Your task is to find and return an integer value representing the latest version

out of all the files that are correctly nared in the array. A file is considered correct if it

follows the format of the file nare as "File$\_$X$"($where X represents the file version number$).$ Retum $-1$ ifthere are n correct files in the array.

Note: A file is incorrect if the name of the file does not ratch the format.

Input

input$1$:A string array S$,$ representing the names of the files

input$2$ : An integer value representing the size of the array

Output Specification:

Return an integer value representing the latest version out of all the files that are

correctly named in the array.

Example $1$:

input$1$:fFile$\_1,$File $3,$File$\_2)$

input$2$:$3$

Output:$3$

Explanation:

Here the given file array is $($File$\_1,$file$\_3,$File$\_2).$ As we can see all the files are following

tho corrert file format nf "File Mersinn" So the serand file has the nreatest file version

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