public Date(){y=1403 ; m=1; d=1;}
public Date(int y , int m , int d){this.y=y; this.m=m; this.d=d;}
public void getdate(int y , int m , int d){this.y=y ; this.m=m ; this.d=d;}
string a=Console.ReadLine();
y=Convert.ToInt32(a.Substring(0,4));
m=Convert.ToInt32(a.Substring(5,2));
d=Convert.ToInt32(a.Substring(8,2));
string a=m .ToString() , b=d.ToString();
Console.WriteLine("{0}/{1}/{2}",y,a,b);
if(y%4!=3 && m==12 && d>29)
public static void Main()