<?php
$input = file_get_contents('input.txt');
$split=str_split($input);
$answer=[];
$split=str_split($input);
$start = 1;
foreach($split as $num){
         if($num == "A"){$num=10;
    }elseif($num == "B"){$num=11;
    }elseif($num == "C"){$num=12;
    }elseif($num == "D"){$num=13;
    }elseif($num == "E"){$num=14;
    }elseif($num == "F"){$num=15;
    }elseif($num == "G"){$num=16;
    }elseif($num == "H"){$num=17;
    }elseif($num == "I"){$num=18;
    }elseif($num == "J"){$num=19;
    }elseif($num == "K"){$num=20;
    }elseif($num == "L"){$num=21;
    }elseif($num == "M"){$num=22;
    }elseif($num == "N"){$num=23;
    }elseif($num == "O"){$num=24;
    }elseif($num == "P"){$num=25;
    }elseif($num == "Q"){$num=26;
    }elseif($num == "R"){$num=27;
    }elseif($num == "S"){$num=28;
    }elseif($num == "T"){$num=29;
    }elseif($num == "U"){$num=30;
    }elseif($num == "V"){$num=31;
    }elseif($num == "W"){$num=32;
    }elseif($num == "X"){$num=33;
    }elseif($num == "Y"){$num=34;
    }elseif($num == "Z"){$num=35;}
    if($num>=$start){
        $start=$num;
    }
}
for($x = $start+1; $x <=36 ; $x++){
    $y = base_convert($input, $x, 10);
    $answer[$x] = strtoupper (base_convert($y+1, 10, $x));
    }
var_dump($answer);
$answer=array_unique($answer);
file_put_contents('output.txt', implode(PHP_EOL, $answer));
?>