C :

#include <stdio.h>
long long a, b, t;
int main(void) {
    scanf("%lld %lld", &a, &b);
    printf("%lld-%lld-", a, b);
    if (b == 1 || b == 3 || b == 5 || b == 7 || b == 8 || b == 10 || b == 12) {
        printf("31");
    } else if (b == 4 || b == 6 || b == 9 || b == 11) {
        printf("30");
    } else {
        if (a % 400 == 0 || (a % 100 != 0 && a % 4 == 0)) {
            printf("29");
        } else {
            printf("28");
        }
    }
    printf("\n");
    return 0;
}

C++ :

#include<iostream>

using namespace std;

int main()
{
	int a,b,c;
	cin>>a>>b;
	if ((b==1)||(b==3)||(b==5)||(b==7)||(b==8)||(b==10)||(b==12)) 
	c=31;
	if ((b==4)||(b==6)||(b==9)||(b==11))
	c=30;
	if (b==2)
	{
		if ((a%4!=0)||(a%100==0&&a%400!=0)) c=28;
        if ((a%100!=0&&a%4==0)||(a%100==0&&a%400==0))  c=29;
	}
	cout<<a<<"-"<<b<<"-"<<c<<endl;
	return 0;
}

Pascal :

var a,b,c:longint;
begin
  readln(a,b);
  case b of
  1,3,5,7,8,10,12:c:=31;
  4,6,9,11:c:=30;
  2:if ((a mod 100<>0) and (a mod 4=0)) or (a mod 400=0) then c:=29 else c:=28;
end;
  writeln(a,'-',b,'-',c);
end.

Python :

# coding=utf-8
s = input(). split()
a = int(s[0])
b = int(s[1])
print(a, b, '', sep = '-', end = '')
if b == 1 or b == 3 or b == 5 or b == 7 or b == 8 or b == 10 or b == 12 :
    print(31)
elif b == 4 or b == 6 or b == 9 or b == 11 :
    print(30)
else :
    if (not a % 400) or (a % 100 and (not a % 4)) :
        print(29)
    else :
        print(28)