#!/usr/bin/perl
use strict;
use warnings;

my %data;
my $last = 0;
while ( <DATA> ) {
    chomp;
    my @names = split;
    $last = @names if @names > $last;
    $_ = ucfirst lc $_ for @names;
    $data{ "@names" } = \@names;
}

for my $index ( 0 .. $last ) {
    for my $person ( keys %data ) {
        next if ! $data{$person}[$index];
        my $old_name = $data{$person}[$index];
        for my $length ( 1 .. length $old_name ) {
            $data{$person}[$index] = substr( $old_name, 0, $length );
            my $match = 0;
            for ( keys %data ) {
                next if $_ eq $person || @{$data{$_}} != @{$data{$person}};
                my $test_name = $data{$_}[$index];
                $data{$_}[$index] = substr( $test_name, 0, $length );
                my ($s_name , $s_test) = ("@{$data{$person}}", "@{$data{$_}}");
                $data{$_}[$index] = $test_name;
                if ( $s_name eq $s_test ) {
                    $match = 1;
                    last;
                }
            }
            last if ! $match;
        }
    }
}
print "@{ $data{$_} } =>\n" for keys %data;

##</code><code>##

__DATA__
Victor Mcduffie
Viola Mcnamee

# Yours
Vic Mcd
Vio Mcn

# Mine
V Mcn
V Mcd