import java.util.Scanner;

public class APlusB {
	static String stringSum(String str1, String str2) {
		if (str1.length() > str2.length()) {
			String t = str1;
			str1 = str2;
			str2 = t;
		}

		String str = "";

		int n1 = str1.length(), n2 = str2.length();

		str1 = new StringBuilder(str1).reverse().toString();
		str2 = new StringBuilder(str2).reverse().toString();

		int carry = 0;
		for (int i = 0; i < n1; i++) {

			int sum = ((int) (str1.charAt(i) - '0') + (int) (str2.charAt(i) - '0') + carry);
			str += (char) (sum % 10 + '0');

			carry = sum / 10;
		}

		for (int i = n1; i < n2; i++) {
			int sum = ((int) (str2.charAt(i) - '0') + carry);
			str += (char) (sum % 10 + '0');
			carry = sum / 10;
		}

		if (carry > 0)
			str += (char) (carry + '0');

		str = new StringBuilder(str).reverse().toString();

		return str;
	}

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		for (int i = 0; i < N; i++) {
			String a = sc.next();
			String b = sc.next();
			System.out.println(stringSum(a, b));
		}
	}

}