/******************************************************************************

                            Online Java Compiler.
                Code, Compile, Run and Debug java program online.
Write your code in this editor and press "Run" button to execute it.

*******************************************************************************/

public class Main
{
    
    checkTwoStringPreffix(stringA, stringB)
        output = ""
        for (i = 0; stringA.lengh(); i++)
            if stringA.charAt(i) == stringB.charAt(j)
                output = output+StringA.charAt(i)
            else
                break
            
    checkRecursively(strArr[], size N)
        intial = arr[0]
        
        for (i = 1;i < N-1, i++){
            intial = checkTwoStringPreffix(inital, arr[i])
        }
        
    
	psvm(strArr[]) 
	    output = checkRecursively({"flower","flow","flight"},  {"flower","flow","flight"}.length)
	    if output.length> 0 
	        Sout("Longest "+output)
	    else
	        Sout("Unavailable")
	   
	    
}