STDIN form:
4 (represents no. of entries in phone directory)
tom 332211
harry 112233
ryan 445566
john 334455
jack
john
jay

Desired Output:
Not found
john 334455
Not found

Actual Code:

use strict;
use warnings;
my @N = <STDIN>;
my $x = $N[0];
my @data;
my @value;
for ( my $j = 1 ; $j <= $x ; $j++ ) {
    my $s = $N[$j];
    chomp $s;
    $s =~ s/\s+/=/g;
    my @v = split( /[\[\],]/, $s ); #create an array from string $s
# assign hash value pairs and insert '=' between them to create phonebook 
    my %hash = map { split( /=/, $_, $x + 1 ) } @v; 
entry
    my $key;
    foreach $key ( keys %hash ) {
        push( @data, $key );
        my $value = $hash{$key};
        push( @value, $value );
    }
}

my $len1 = $#data;
splice @N, 0, $x + 1;
chomp @N;
my $len2 = $#N;

for ( my $i = 0 ; $i <= $len2 ; $i++ ) {
    if ( grep( /^$N[$i]/, @data ) ) {
        for ( my $m = 0 ; $m <= $len1 ; $m++ ) {
            if ( $data[$m] eq $N[$i] ) {
                print("$data[$m]=$value[$m]\n");
            }
        }
    }
    else {
        print("Not found\n");
    }
}