Problem:
Score : 100 points

Problem Statement

You are given four digits N_1, N_2, N_3 and N_4. Determine if these can be arranged into the sequence of digits "1974".

Constraints

0 \leq N_1, N_2, N_3, N_4 \leq 9

N_1, N_2, N_3 and N_4 are integers.

Input

Input is given from Standard Input in the following format:

N_1 N_2 N_3 N_4

Output

If N_1, N_2, N_3 and N_4 can be arranged into the sequence of digits "1974", print YES; if they cannot, print NO.

Sample Input 1

1 7 9 4

Sample Output 1

YES

We can get 1974 by swapping N_2 and N_3.

Sample Input 2

1 9 7 4

Sample Output 2

YES

We already have 1974 before doing anything.

Sample Input 3

1 2 9 1

Sample Output 3

NO

Sample Input 4

4 9 0 8

Sample Output 4

NO

Solution in Perl (v5.18.2) (judge verdict: Wrong Answer)

    use warnings;
    use Data::Dumper;
    use List::Util qw(max min);
    # use Statistics::Lite qw(max min sum);
    
    sub GetInputData{
    
        my @array_data;
    
        my $line = <STDIN>;
    
        chomp($line);
    
        while($line ne ""){
    
           push(@array_data,$line);
    
           $line = <STDIN>;
    
           chomp($line);
    
    }
    
        return @array_data;
    
    }
    
    sub GetSpaceInputData{
    
        my @array_temp=GetInputData();
    
        my @array_buf;
    
        foreach(@array_temp){
    
            #戻りは配列スペース区切りを分解
            # myを先頭につける必要あり
            my @array_work=split(" ",$_);

            # print "@array_work";
    
            # リファレンスを配列に代入
            push(@array_buf,\@array_work);
        }
    
        return @array_buf;
    
    }
    
    my @arr_result = GetSpaceInputData();

    my $arr = $arr_result[0];

    # print "@$arr";

    my $chkflg=True;
    unless (grep {$_ == 1} @$arr) {
        $chkflg=False;
    }
    unless (grep {$_ == 9} @$arr) {
        $chkflg=False;
    }
    unless (grep {$_ == 7} @$arr) {
        $chkflg=False;
    }
    unless (grep {$_ == 4} @$arr) {
        $chkflg=False;
    }


    print $chkflg ? "YES" : "NO";