#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
#define N 2020
#define INF 1001000

using namespace std;

int n;
int a[N],b[N];
int dp[N][2];

int main() {
    int t;
    cin>>t;
    while(t--) {
        scanf("%d",&n);
        for(int i=1; i<=n; i++)
            scanf("%d",&a[i]);
        b[0]=INF;
        for(int i=2; i<=n; i++)
            scanf("%d",&b[i]);
        dp[1][0]=a[1];
        dp[1][1]=INF;
        dp[0][0]=0;
        dp[0][1]=0;
        for(int i=2; i<=n; i++) {
            dp[i][0]=a[i]+min(dp[i-1][0],dp[i-1][1]);
            dp[i][1]=b[i]+min(dp[i-2][0],dp[i-2][1]);
        }
        int ans=min(dp[n][1],dp[n][0]);
        int se=ans%60;
        ans/=60;
        int mins=ans%60;
        ans/=60;
        int h=ans+8;
        int flag=0;
        if(h<10)printf("0%d:",h);
        else if(h>=10&&h<=11)printf("%d:",h);
        else {
            int hh=h-12;
            if(hh<10)printf("0");
            printf("%d:",hh);
            flag=1;
        }
        if(mins<10)printf("0");
        printf("%d:",mins);
        if(se<10)
            printf("0");
        printf("%d",se);
        if(flag)printf(" pm\n");
        else printf(" am\n");
    }
}