#include <bits/stdc++.h>
using namespace std;
int main(int argc, char *argv[]) {
  ios::sync_with_stdio(false);
  cin.tie(NULL);
  string a, b;
  cin >> a >> b;
  if (a == b) {
    cout << a << endl;
  } else {
    cout << 1 << endl;
  }
  return 0;
}
