#include<stdio.h>
#include<cstring>
struct people
{
    char name[10];
    char birthday[11];
    //people():name(""),birthday(""){}
};
int main()
{
    int n,count=0;
    scanf("%d",&n);

    char today[11]="2014/09/06";
    char lower_bound[11]="1814/09/06";

    struct people maxD={"","2014/09/06"},minD={"","1814/09/06"};//maxD = the oldest, minD=the youngest;
    for(int i=0;i<n;i++)
    {
        struct people s;
        scanf(" %s%s",s.name,s.birthday);
        if(strcmp(s.birthday,today)>0 || strcmp(s.birthday,lower_bound)==-1) continue;//find the worry date;
        count++;
        if(strcmp(s.birthday,maxD.birthday)<0) maxD=s;//s is older than maxD
        if(strcmp(s.birthday,minD.birthday)>0) minD=s;//s is younger than minD
    }
    printf("%d",count);
    if(count == 1)
        if(strcmp(maxD.name,minD.name)>0) printf(" %s %s\n",maxD.name,maxD.name);//when count=1
        else printf(" %s %s\n",minD.name,minD.name);
    if(count > 1) printf(" %s %s\n",maxD.name,minD.name);
    return 0;
}