hdu1260

import java.util.Scanner;


public class Main
{
	public static void main(String[] args)
	{
		Scanner sc = new Scanner(System.in);
		while (sc.hasNext())
		{
			int x=sc.nextInt();
			while(x-->0) {
				int g=sc.nextInt();
				int max=Integer.MAX_VALUE;
				int arr[]=new int[g+1];
			
				for (int i = 1; i < arr.length; i++)
				{
					arr[i]=sc.nextInt();
				}
	
					int ok []=new int[g+1];
					for (int i = 2; i < ok.length; i++)
					{
						ok[i]=sc.nextInt();
					}
					int dp[]=new int[g+1];
					dp[1]=arr[1];
					for (int i = 2; i < dp.length; i++)
					{
						dp[i]=Math.min(dp[i-2]+ok[i], dp[i-1]+arr[i]);
					}
					int all =dp[dp.length-1];
					int h=8;int m=0;int s =0;
					s=all%60;all/=60;m=all%60;h=8+all/60;
					System.out.printf("%02d:%02d:%02d",h,m,s);
					if (h>=12)
					{
						System.out.println(" pm");
					}else {
						System.out.println(" am");
					}
		
				
			}
		}
	}
}