#include<stdio.h>
#include<string.h>
#define MAX 2100
#define min(x,y)(x<y?x:y)
int a[MAX],b[MAX],dp[MAX];
int main()
{
	int t,i,j,n;
	int h,m,s;
	int sum,tot;
	scanf("%d",&t);
	while(t--)
	{
		memset(dp,0,sizeof(dp));
		scanf("%d",&n);
		for(i=1;i<=n;i++)
		    scanf("%d",&a[i]);
		for(i=2;i<=n;i++)
		    scanf("%d",&b[i]);
		dp[1]=a[1];
	   for(i=2;i<=n;i++)
	   	  dp[i]=min(dp[i-1]+a[i],dp[i-2]+b[i]);
	   	  //printf("%d\n",dp[n]);
	   sum=dp[n];
	   h=0;s=0;m=0;
	   s=sum%60;
	   m=(sum-s)/60;
	   if(m>=60)
	   {
	   	   h=h+m/60;
	   	   m=m%60;
	   }
	   h=8+h;
	   if(h<=12) 
	   printf("%02d:%02d:%02d am\n",h,m,s);
	   else
	   {
	   	 h-=12;
	   	 printf("%02d:%02d:%02d pm\n",h,m,s);
	   }
	   
    }
	return 0;
}