#include <iostream>
#include <time.h>
using namespace std;
#define debug(x) cerr << #x << " = " << (x) << " (L" << __LINE__ << ")" << endl;
static int GetDays(int y, int m, int d)
{
if (m <= 2)
{
--y;
m += 12;
}
int dy = 365 * (y - 1);
int c = y / 100;
int dl = (y >> 2) - c + (c >> 2);
int dm = (m * 979 - 1033) >> 5;
return dy + dl + dm + d - 1;
}
int main () {
int a,b,c,n,year,month,day;
cin>>a>>b>>c>>n;
time_t now = time(NULL);
struct tm *pnow = localtime(&now);
year = pnow->tm_year+1900;
month = pnow->tm_mon + 1;
day = pnow->tm_mday;
int x,y,z;
x=GetDays(a,b,c); y=GetDays(a+n,b,c); z=GetDays(year, month, day);
double ratio = (double) (z-x)/(y-x);
int hour,min,second = (int) 24*60*60*ratio;
hour = second/(60*60); second%=60*60;
min = second/60; second%=60;
cout<<"birthday:\t"<<a<<"/"<<b<<"/"<<c<<endl;
cout<<"today: \t"<<year<<"/"<<month<<"/"<<day<<endl;
cout<<"life span:\t"<<n<<endl;
cout<<"answer: \t"<<hour<<":"<<min<<":"<<second<<endl;
}