<?php
/**
 * Auto-generated code below aims at helping you parse
 * the standard input according to the problem statement.
 **/

fscanf(STDIN, "%s",
    $LON
);
fscanf(STDIN, "%s",
    $LAT
);
fscanf(STDIN, "%d",
    $N
);

$defibs = [];

for ($i = 0; $i < $N; $i++)
{
    $defibs[] = explode(';', stream_get_line(STDIN, 256, "\n"));
}

$key = null;
$distance = null;

function f($s) {
    return (float) str_replace(',', '.', $s);
}

$la1 = f($LAT);
$lo1 = f($LON);


foreach ($defibs as $k => $defib) {
   $la2 = f($defib[5]);
   $lo2 = f($defib[4]);
   
   $x = ($lo2 - $lo1) * cos(($la1 + $la2) / 2);
   $y = ($la2 - $la1);
   
   $d = sqrt($x*$x + $y*$y) * 6371;

   if (null === $distance || $d < $distance) {
        $distance = $d;
        $key = $k;
   }
}
// Write an action using echo(). DON'T FORGET THE TRAILING \n
// To debug (equivalent to var_dump): error_log(var_export($var, true));

echo $defibs[$key][1], "\n";
?>