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#include <iostream>
#include <string>
#include <fstream>
using namespace std;
// int gcd(int a, int b) {
// int t;
// while (b) {
// t = a;
// a = b;
// b = t % b;
// }
// return a;
// }
int gcd(int a, int b) {
if (!b) return a;
return gcd(b, a % b);
}
int main() {
string T;
string as, bs;
ifstream euclidIn("euclid2.in");
ofstream euclidOut("euclid2.out");
euclidIn >> T;
for (int i = 0; i < stoi(T); i++) {
euclidIn >> as >> bs;
int a = stoi(as);
int b = stoi(bs);
euclidOut << gcd(a, b) << endl;
}
return 0;
}