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/* [A][M][C][B][N] / [K][R][I][P][6][8] */
#include <bits/stdc++.h>
#pragma warning(disable : 4996)
using namespace std;
// Global variables
const char sp = ' ', nl = '\n';
const int MOD = 777013; // 666013 998244353 1000000007
ifstream fin("euclid2.in");
ofstream fout("euclid2.out");
void solve() {
int a, b;
fin >> a >> b;
while (b) a %= b, swap(a, b);
fout << a << nl;
}
int main() {
int t;
fin >> t;
while (t--) {
solve();
}
}