codeforces305A

Strange Addition

CodeForces - 305A

Unfortunately, Vasya can only sum pairs of integers (a, b), such that for any decimal place at least one number has digit 0 in this place. For example, Vasya can sum numbers 505 and 50, but he cannot sum 1 and 4.

Vasya has a set of k distinct non-negative integers d₁, d₂, ..., d_k.

Vasya wants to choose some integers from this set so that he could sum any two chosen numbers. What maximal number of integers can he choose in the required manner?

Input

The first input line contains integer k (1 ≤ k ≤ 100) — the number of integers.

The second line contains k distinct space-separated integers d₁, d₂, ..., d_k (0 ≤ d_i ≤ 100).

Output

In the first line print a single integer n the maximum number of the chosen integers. In the second line print n distinct non-negative integers — the required integers.

If there are multiple solutions, print any of them. You can print the numbers in any order.

Examples

Input

4
100 10 1 0

Output

4
0 1 10 100 

Input

3
2 70 3

Output

2
2 70 

sol：我太菜了，只会分类讨论一大堆情况qaq，简直就是个智障

#include <bits/stdc++.h>
using namespace std;
typedef int ll;
inline ll read()
{
    ll s=;
    bool f=;
    char ch=' ';
    while(!isdigit(ch))
    {
        f|=(ch=='-'); ch=getchar();
    }
    while(isdigit(ch))
    {
        s=(s<<)+(s<<)+(ch^); ch=getchar();
    }
    return (f)?(-s):(s);
}
#define R(x) x=read()
inline void write(ll x)
{
    if(x<)
    {
        putchar('-'); x=-x;
    }
    if(x<)
    {
        putchar(x+''); return;
    }
    write(x/);
    putchar((x%)+'');
    return;
}
#define W(x) write(x),putchar(' ')
#define Wl(x) write(x),putchar('\n')
const int N=;
int n,a[N],Id[]={};
inline void put0(int n)
{
    int i;
    for(i=;i<=n;i++) W();
}
int main()
{
    int i,j,ans=;
    R(n);
    for(i=;i<=n;i++)
    {
        R(a[i]);
        if(a[i]==) ans++;//
        else if(a[i]<) Id[]=i;//00x
        else if(a[i]<)
        {
            if(a[i]%==) Id[]=i;//0x0
            else Id[]=i; //0xx
        }
        else
        {
            if(a[i]%==) Id[]=i;//x00
            else if(a[i]%==) Id[]=i; //xx0;
            else if((a[i]-a[i]%)%==) Id[]=i; //x0x
            else Id[]=i; //xxx
        }
    }
    if(Id[])
    {
        if(Id[])
        {
            if(Id[])
            {
                Wl(ans+); put0(ans); W(a[Id[]]); W(a[Id[]]); W(a[Id[]]);
            }
            else
            {
                Wl(ans+); put0(ans); W(a[Id[]]); W(a[Id[]]);
            }
        }
        else
        {
            if(Id[])
            {
                Wl(ans+); put0(ans); W(a[Id[]]); W(a[Id[]]);
            }
            else if(Id[])
            {
                Wl(ans+); put0(ans); W(a[Id[]]); W(a[Id[]]);
            }
            else
            {
                Wl(ans+); put0(ans); W(a[Id[]]);
            }
        }
    }
    else if(Id[])
    {
        if(Id[])
        {
            Wl(ans+); put0(ans); W(a[Id[]]); W(a[Id[]]);
        }
        else if(Id[])
        {
            Wl(ans+); put0(ans); W(a[Id[]]); W(a[Id[]]);
        }
        else
        {
            Wl(ans+); put0(ans); W(a[Id[]]);
        }
    }
    else if(Id[])
    {
        if(Id[])
        {
            Wl(ans+); put0(ans); W(a[Id[]]); W(a[Id[]]);
        }
        else
        {
            Wl(ans+); put0(ans); W(a[Id[]]);
        }
    }
    else if(Id[])
    {
        Wl(ans+); put0(ans); W(a[Id[]]);
    }
    else if(Id[])
    {
        Wl(ans+); put0(ans); W(a[Id[]]);
    }
    else if(Id[])
    {
        Wl(ans+); put0(ans); W(a[Id[]]);
    }
    else if(Id[])
    {
        Wl(ans+); put0(ans); W(a[Id[]]);
    }
    else
    {
        Wl(ans); put0(ans);
    }
    return ;
}
/*
Input
4
100 10 1 0
Output
4
0 1 10 100 

Input
3
2 70 3
Output
2
2 70
*/