#include<bits/stdc++.h>
using namespace std;
long long num1; string qwq,g = "1",h;
int a1[100005],a2[100005],len1,len2,a[200005],len;
string cheng(string num1,string num2){
	string str = "";
	if(num1 == "0" || num2 == "0"){
		str = "0";
		return str;
	}
    memset(a1,0,sizeof a1);
	memset(a2,0,sizeof a2);
	memset(a,0,sizeof a);
	len1 = num1.size();
    for (int i = 0; i < len1;i++) {
        a1[i] =num1[len1-1-i] - '0';
    }
    len2 = num2.size();
    for (int i = 0; i < len2;i++) {
        a2[i]=num2[len2-1-i]-'0';
    }
    for (int i = 0; i < len1;i++) {
        for (int j = 0; j < len2;j++){
        	a[i + j] += a1[i] * a2[j];
        }
    }
    len = len1 + len2 - 1;
    for (int i = 0; i < len; i++) {
        a[i + 1] += a[i] / 10;
        a[i] %= 10;
    }
    while (a[len]) {
        a[len + 1] += a[len] / 10;
        a[len] %= 10;
        len++;
    }
    for (int i = len - 1; i >= 0; i--) {
        str += a[i]+'0';
    }
    return str;
}
int main() {
    freopen("bigmul.in", "r", stdin);
    freopen("bigmul.out", "w", stdout);
    long long a;
    string s1,s2;
    scanf("%lld",&a);
    for(int i = 1;i <= a;i++){
    	cin >> s1 >> s2;
    	cout << cheng(s1,s2) << endl;
	}
    return 0;
}