<?php
 
// JSUMDUZE
 
$t = (int)fgets(STDIN);
 
for($i = 0; $i < $t; $i++) {
 
    $numbers = explode(' ', trim(fgets(STDIN)));
    $numberOne = strrev($numbers[0]);
    $numberTwo = strrev($numbers[1]);
    $result = "";
    $memory = 0;
 
    if(strlen($numberOne) > strlen($numberTwo)) {
        $longer = $numberOne;
        $shorter = $numberTwo;
    } else {
        $shorter = $numberOne;
        $longer = $numberTwo;
    }
 
    for($j = 0; $j < strlen($longer); $j++) {
 
        $adding = $longer[$j] + (isset($shorter[$j]) ? $shorter[$j] : 0) + $memory;
 
        $result .= $adding % 10;
        $memory = floor($adding / 10);
 
    }
 
    printf("%s\n", strrev($result));
 
}

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