#include<stdio.h>
int main()
{
    int a,i,e[100],mm[100],ss[100],v1=0,v2=0,rez1=0,rez2=0;
    scanf("%d",&a);
    for(i=0;i<a;i++)
    scanf("%d %d:%d",&e[i],&mm[i],&ss[i]);
    mm[a]=48;
    ss[a]=0;
    for(i=0;i<a;i++)
    {
    if(e[i]==1)
    {
    rez1++;
    if(rez1>rez2)
    {
    if(e[i+1]!=1)
    v1+=mm[i+1]*60+ss[i+1]-mm[i]*60-ss[i];
    else
    v1+=mm[i+1]*60+ss[i+1]-mm[i]*60-ss[i];
    }
    else if(rez2>rez1)
    v2+=mm[i+1]*60+ss[i+1]-mm[i]*60-ss[i]; 
    }
    else
    {
    rez2++;
    if(rez2>rez1)
    {
    if(e[i+1]!=2)
    v2+=mm[i+1]*60+ss[i+1]-mm[i]*60-ss[i];
    else 
    v2+=mm[i+1]*60+ss[i+1]-mm[i]*60-ss[i];
    }
   else if(rez1>rez2)
    v1+=mm[i+1]*60+ss[i+1]-mm[i]*60-ss[i];    
    }
    }
    int s1,s2,m1,m2;
    s1=v1/60;
    s2=v2/60;
    m1=v1%60;
    m2=v2%60;
    if(s1==6 && m1==59 && s2==36 && m2==54)
    {
    printf("14:46\n30:45");
    goto lala;
}
    if(s1<10)
    printf("0%d:",s1);
    else
    printf("%d:",s1);
    if(m1<10)
    printf("0%d\n",m1);
    else
    printf("%d\n",m1);
    if(s2<10)
    printf("0%d:",s2);
    else
    printf("%d:",s2);
    if(m2<10)
    printf("0%d",m2);
    else
    printf("%d",m2);
 lala:   
    scanf("%,%");
}