#!/usr/bin/perl
use strict;

{
local %_;
	while(<DATA>){
		chomp;
		if(/(\d+|[A-Z])$/){
			$_{substr($_,0,(length($_)-length($1)))}->{$1} = $_;
		}
	}
	for(sort keys %_){
		if(scalar(keys %{$_{$_}}) % 2 == 0){
			local @_ = sort{$a <=> $b || ord($a) <=> ord($b)}keys %{$_{$_}};
			for(my $i = 0; $i < scalar(@_); $i+=2){
				if( ($_[$i] =~ /\d$/ && abs($_[$i] - $_[$i+1]) == 1) || (abs(ord($_[$i]) - ord($_[$i+1])) == 1) ){
					print $_{$_}->{$_[$i]}.";".$_{$_}->{$_[$i+1]}."\n" ;
					print $_{$_}->{$_[$i+1]}.";".$_{$_}->{$_[$i]}."\n" ;
				}
			}
		}
	}
}
__DATA__
AAA30
BBC5
SHT12H
DAL33B
BBC49
AAA31
BBC8
BBC3
DAL33A
BBC6
SHT12G
BBC50